Moving from Auth0, Firebase, a home-grown system or anything else to Cognito or another provider: bulk import with password hashes (Cognito accepts bcrypt, scrypt, Argon2id and PBKDF2 since July 2026), lazy migration at sign-in, what cannot move, and a cut-over plan with a way back.
Most migrations use both: bulk-import everyone whose hash you can export, keep lazy migration for the rest, and after a few months send the remaining inactive users a password reset.
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MFA enrolments — authenticator apps and SMS factors usually need re-enrolment, so prompt for it after the first sign-in on the new system.
Passkeys, in practice: plan for re-enrolment.
Social sign-in links: re-link by verified email, carefully — matching on an unverified email is an account-takeover bug.
Provider-specific hooks and rules: re-implement them as triggers or code in the new system, and test each.
Active sessions: users sign in once more at cut-over.
Make your own user ID the primary key in your application, with the provider's ID as an attribute — the change that makes every future migration easier.
Run the new provider in parallel for internal users and a test cohort.
Bulk-import, enable lazy migration, and switch new sign-ups to the new provider.
Move existing users' sign-in behind a flag, a cohort at a time, watching failure rates.
Keep the old provider read-only for a rollback window; delete exported hash files once imported.
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As of October 26, 2026. Provided as is, for general information, and accurate to the best of our knowledge on the date shown. Not legal, compliance, tax, financial or other professional advice. Prices, limits and vendor services change; check current vendor documentation before relying on anything here. Terms of use.