diff --git a/app/src/main/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptions.kt b/app/src/main/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptions.kt
index 62a364410f7..93cac923d4a 100644
--- a/app/src/main/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptions.kt
+++ b/app/src/main/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptions.kt
@@ -4,15 +4,17 @@ import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
 /**
- * Models FIDO 2 credential creation request options received from a Relying Party (RP).
+ * Models FIDO 2 credential creation request options received from a Relying Party (RP),
+ * based off the spec found at:
+ * https://www.w3.org/TR/webauthn-2/#dictionary-makecredentialoptions
  */
 @Serializable
 data class PasskeyAttestationOptions(
     @SerialName("authenticatorSelection")
-    val authenticatorSelection: AuthenticatorSelectionCriteria,
+    val authenticatorSelection: AuthenticatorSelectionCriteria? = null,
     @SerialName("challenge")
     val challenge: String,
-    @SerialName("excludedCredentials")
+    @SerialName("excludeCredentials")
     val excludeCredentials: List<PublicKeyCredentialDescriptor> = emptyList(),
     @SerialName("pubKeyCredParams")
     val pubKeyCredParams: List<PublicKeyCredentialParameters>,
@@ -42,7 +44,7 @@ data class PasskeyAttestationOptions(
             @SerialName("platform")
             PLATFORM,
 
-            @SerialName("cross_platform")
+            @SerialName("cross-platform")
             CROSS_PLATFORM,
         }
 
@@ -51,6 +53,12 @@ data class PasskeyAttestationOptions(
          */
         @Serializable
         enum class ResidentKeyRequirement {
+            /**
+             * Resident keys are not preferred during selection.
+             */
+            @SerialName("discouraged")
+            DISCOURAGED,
+
             /**
              * Resident keys are preferred during selection, if supported.
              */
diff --git a/app/src/test/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptionsTest.kt b/app/src/test/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptionsTest.kt
new file mode 100644
index 00000000000..1438c51661e
--- /dev/null
+++ b/app/src/test/kotlin/com/x8bit/bitwarden/data/credentials/model/PasskeyAttestationOptionsTest.kt
@@ -0,0 +1,197 @@
+package com.x8bit.bitwarden.data.credentials.model
+
+import com.bitwarden.core.data.util.decodeFromStringOrNull
+import com.bitwarden.core.di.CoreModule
+import io.mockk.mockk
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertFalse
+import org.junit.jupiter.api.Assertions.assertTrue
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertNotNull
+
+class PasskeyAttestationOptionsTest {
+
+    private val json = CoreModule.providesJson(buildInfoManager = mockk(relaxed = true))
+
+    @Test
+    fun `options without authenticatorSelection should be deserialized`() {
+        val result = json.decodeFromStringOrNull<PasskeyAttestationOptions>(
+            OPTIONS_WITHOUT_AUTHENTICATOR_SELECTION_JSON,
+        )
+
+        assertNotNull(result)
+        assertEquals(RELYING_PARTY_ID, result.relyingParty.id)
+    }
+
+    @Test
+    fun `excludeCredentials should be deserialized from the spec member name`() {
+        val result = json.decodeFromStringOrNull<PasskeyAttestationOptions>(OPTIONS_JSON)
+
+        assertNotNull(result)
+        assertEquals(
+            listOf(EXCLUDED_CREDENTIAL_ID),
+            result.excludeCredentials.map { it.id },
+        )
+    }
+
+    @Test
+    fun `excludeCredentials should be serialized with the spec member name`() {
+        val options = createOptions(
+            excludeCredentials = listOf(
+                PublicKeyCredentialDescriptor(
+                    type = "public-key",
+                    id = EXCLUDED_CREDENTIAL_ID,
+                    transports = null,
+                ),
+            ),
+        )
+
+        val result = json.encodeToString(options)
+
+        assertTrue(result.contains("\"excludeCredentials\""))
+        assertFalse(result.contains("\"excludedCredentials\""))
+    }
+
+    @Test
+    fun `cross-platform attachment should be deserialized from the spec value`() {
+        val result = json.decodeFromStringOrNull<PasskeyAttestationOptions>(OPTIONS_JSON)
+
+        assertNotNull(result)
+        assertEquals(
+            PasskeyAttestationOptions
+                .AuthenticatorSelectionCriteria
+                .AuthenticatorAttachment
+                .CROSS_PLATFORM,
+            result.authenticatorSelection?.authenticatorAttachment,
+        )
+    }
+
+    @Test
+    fun `cross-platform attachment should be serialized with the spec value`() {
+        val options = createOptions(
+            authenticatorSelection = PasskeyAttestationOptions.AuthenticatorSelectionCriteria(
+                authenticatorAttachment = PasskeyAttestationOptions
+                    .AuthenticatorSelectionCriteria
+                    .AuthenticatorAttachment
+                    .CROSS_PLATFORM,
+            ),
+        )
+
+        val result = json.encodeToString(options)
+
+        assertTrue(result.contains("\"cross-platform\""))
+        assertFalse(result.contains("\"cross_platform\""))
+    }
+
+    @Test
+    fun `discouraged residentKey should be deserialized from the spec value`() {
+        val result = json.decodeFromStringOrNull<PasskeyAttestationOptions>(OPTIONS_JSON)
+
+        assertNotNull(result)
+        assertEquals(
+            PasskeyAttestationOptions
+                .AuthenticatorSelectionCriteria
+                .ResidentKeyRequirement
+                .DISCOURAGED,
+            result.authenticatorSelection?.residentKeyRequirement,
+        )
+    }
+
+    @Test
+    fun `discouraged residentKey should be serialized with the spec value`() {
+        val options = createOptions(
+            authenticatorSelection = PasskeyAttestationOptions.AuthenticatorSelectionCriteria(
+                residentKeyRequirement = PasskeyAttestationOptions
+                    .AuthenticatorSelectionCriteria
+                    .ResidentKeyRequirement
+                    .DISCOURAGED,
+            ),
+        )
+
+        val result = json.encodeToString(options)
+
+        assertTrue(result.contains("\"discouraged\""))
+    }
+}
+
+private const val RELYING_PARTY_ID = "www.bitwarden.com"
+private const val EXCLUDED_CREDENTIAL_ID = "mockCredentialId"
+
+private fun createOptions(
+    authenticatorSelection: PasskeyAttestationOptions.AuthenticatorSelectionCriteria? = null,
+    excludeCredentials: List<PublicKeyCredentialDescriptor> = emptyList(),
+): PasskeyAttestationOptions = PasskeyAttestationOptions(
+    authenticatorSelection = authenticatorSelection,
+    challenge = "tZ1rLJ_paLC8IMmg",
+    excludeCredentials = excludeCredentials,
+    pubKeyCredParams = listOf(
+        PasskeyAttestationOptions.PublicKeyCredentialParameters(
+            type = "public-key",
+            alg = -7.0,
+        ),
+    ),
+    relyingParty = PasskeyAttestationOptions.PublicKeyCredentialRpEntity(
+        id = RELYING_PARTY_ID,
+        name = "mockRpName",
+    ),
+    user = PasskeyAttestationOptions.PublicKeyCredentialUserEntity(
+        id = "UmhpTE9NOUY",
+        name = "mockUserName",
+        displayName = "mockDisplayName",
+    ),
+)
+
+private val OPTIONS_JSON = """
+{
+  "authenticatorSelection": {
+    "authenticatorAttachment": "cross-platform",
+    "residentKey": "discouraged",
+    "userVerification": "preferred"
+  },
+  "challenge": "tZ1rLJ_paLC8IMmg",
+  "excludeCredentials": [
+    {
+      "type": "public-key",
+      "id": "$EXCLUDED_CREDENTIAL_ID"
+    }
+  ],
+  "pubKeyCredParams": [
+    {
+      "alg": -7,
+      "type": "public-key"
+    }
+  ],
+  "rp": {
+    "id": "$RELYING_PARTY_ID",
+    "name": "mockRpName"
+  },
+  "user": {
+    "displayName": "mockDisplayName",
+    "id": "UmhpTE9NOUY",
+    "name": "mockUserName"
+  }
+}
+"""
+    .trimIndent()
+
+private val OPTIONS_WITHOUT_AUTHENTICATOR_SELECTION_JSON = """
+{
+  "challenge": "tZ1rLJ_paLC8IMmg",
+  "pubKeyCredParams": [
+    {
+      "alg": -7,
+      "type": "public-key"
+    }
+  ],
+  "rp": {
+    "id": "$RELYING_PARTY_ID",
+    "name": "mockRpName"
+  },
+  "user": {
+    "displayName": "mockDisplayName",
+    "id": "UmhpTE9NOUY",
+    "name": "mockUserName"
+  }
+}
+"""
+    .trimIndent()