Quick answer: Read the exact keychain and app named in the prompt, try the previous Mac login password if it was recently changed, and reset only the affected credential or keychain after backing up access.
Repeated keychain prompts often follow a login-password change, a locked keychain, a stale saved credential, or an app repeatedly requesting an old secret. Work through one test at a time so the result identifies the layer that is failing.
Why this happens
The best clue is the boundary of the problem: one file or every file, one device or several, one network or every network. Note when it began and any update, hardware change, permission prompt, or account alert that happened just before it.
- The Mac login password changed without updating the login keychain.
- One saved Wi-Fi, mail, certificate, or app password is stale.
- The login keychain is locked or its default changed.
- A sync, VPN, mail, or management app is repeatedly retrying.
Fix it in the safest order
- Take a screenshot without revealing the password and note the named app and keychain.
- Open Keychain Access and confirm the login keychain is default and unlocks.
- If the Mac password changed recently, update the keychain password using the previous login password.
- Remove only the identified stale item and sign in again through the official app.
- Create a new login keychain only as a last resort because saved passwords and certificates may need to be re-added.
Repeat the same small test after each change. Keep a note of the original setting so you can restore it if the change does not help.
How to confirm the fix
Restart the Mac and open the affected app twice; no unexplained prompt should return and other saved credentials should still work.
Common mistakes to avoid
- Do not type a password into a prompt whose app or publisher you cannot identify.
- Do not delete the entire Keychains folder.
- Do not reset the keychain before confirming account recovery methods.
FAQ
Why does the old Mac password sometimes work?
The login keychain can remain encrypted with the previous password after the account password changes outside the normal macOS flow.
Should I reset or reinstall everything?
No. A factory reset destroys useful evidence and is rarely the first step. Back up important data, test a second file, account, network, or device, and use the narrowest reset that matches the confirmed cause.
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