Auth Issue: Apple Relay Email Conflict

Error: 500: Multiple accounts with the same email address detected Problem Summary A conflict occurs when a user signs up via Apple (using "Hide My Email") and later attempts to log in with their Standard Email (Google or Email/Password). Even though Apple uses a private relay address (@privaterelay.appleid.com), Supabase eventually detects that both identities belong to the same user but treats them as two distinct user_id entries. This prevents the "identity linking" process and triggers a 500 error during the /token exchange. Steps to Reproduce Signup A: Use "Sign in with Apple" + Hide My Email. Result: User created as ID_1 with anon@privaterelay.appleid.com. Signup B: Use Google or Email/Password with the primary email (e.g., user@gmail.com). Result: User created as ID_2. Conflict: Future login attempts fail because Supabase detects the primary email is already associated with a different internal identity domain. Technical Evidence Path: POST /auth/v1/token Log ID: 9ddcb602b406bcff-CCU Database State: auth.identities shows two different user_id values for the same verified person.