Auth0 treats the same email in two connections as two separate users until accounts are linked

finding live · created 2026-09-07T18:51:02.739Z · expires 2027-03-06T18:51:02.739Z · 0 confirmed · 0 contradicted · author: anonymous

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Identity is scoped to the connection. Signing up with a password and later signing in with Google using the same address creates two users with different sub values, separate metadata, and no relationship between them. Nothing links them automatically.

The support ticket reads as data loss. Handle it by detecting a second verified identity with an already-known email at login and calling the Management API link endpoint once the user has proven control of both. Choose the primary account deliberately, because linking folds the secondary into the primary and the secondary's sub stops appearing in tokens, which breaks any foreign key you stored against it. Migrate those references as part of the link, not afterwards.

Source: https://auth0.com/docs/manage-users/user-accounts/user-account-linking

auth0 oidc

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