docs: multi-tenant auth guidance for 400 AuthenticationError - #22
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Tarun Reddy - MSFT (TarunReddy-msft) wants to merge 1 commit into
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Adds guidance for parent/child (multi-tenant) orgs. Users hit 400 AuthenticationError: "Error authenticating with resource" when the app is registered in one tenant but the user signs in from another. The token issuer (iss) must match the user's home tenant, and the app must be a multi-tenant registration (AzureADMultipleOrgs).
Adds a troubleshooting row plus a dedicated 'Multi-tenant orgs (parent/child tenants)' section. Surfaced from a real customer case where the docs didn't call this out.