On the Sync your Passwords screen, select Install Extension next to Microsoft Edge. Select Get on the extension's listing page in Microsoft Edge, and choose Add extension.

Microsoft is phasing out the password management feature in its Authenticator app, urging users to back up their saved passwords immediately. This functionality will be transferred to the Edge ...

Although the app will continue to provide authentication for passkey-compatible services, it is pushing its password management and autofill functions out to the company’s Edge browser instead.