Supabase Auth errorSupabase Auth: single_identity_not_deletable

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Why the identity can’t be unlinked, and the fix

1. 01

   It is the user’s only identity

   “Every user must have at least one identity attached to it, so deleting (unlinking) an identity is not allowed if it's the only one for the user.” Supabase docs, Auth error codes (single_identity_not_deletable)

   A user who signed up with Google and nothing else has one identity. Unlinking it would leave no way to sign in, so Supabase refuses.

2. 02

   The settings screen shows Disconnect for every provider

   “The user needs to be signed in and have at least 2 linked identities in order to unlink an existing identity.” Supabase docs, Identity Linking

   Hide or disable the Disconnect button when getUserIdentities() returns a single identity, and explain that another sign-in method has to be added first.

   const { data } = await supabase.auth.getUserIdentities();
   const canUnlink = (data?.identities ?? []).length > 1;

3. 03

   The new provider was never linked

   Moving a user from email to Google means linking Google first with linkIdentity(), which needs manual linking turned on, and only then unlinking the email identity.

4. 04

   Unlinking would clash with another account

   “Unlinking this identity causes the user's account to change to an email address which is already used by another user account.” Supabase docs, Auth error codes (email_conflict_identity_not_deletable)

   Also check: if unlinking would change the account’s email to one another user already has, the error is email_conflict_identity_not_deletable instead.

Checked against the vendor’s docs on November 10, 2026: Supabase docs: Auth error codes; Supabase docs: Identity Linking.

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