This happened in my environment when I created a persistent session conditional access policy and set it to report-only mode.
Disabling the policy resolved the issue.
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I have a MacBook with Monterey OS that is enrolled through Intune. For some reason when the user attempts to access SharePoint online through Google Chrome she receives a prompt "Google Chrome wants to sign using key "Microsoft Workplace Join Key" in your keychain. Even if she selects Always Allow, she gets prompted again.
This happened in my environment when I created a persistent session conditional access policy and set it to report-only mode.
Disabling the policy resolved the issue.
It comes from the keychain ACL for Microsoft Workplace Joinkey. By default, all microsoft apps can access it (com.microsoft and Microsoft portal). Obviously here Chrome, is used to access to Sharepoint. It might be the same for other apps used to enter a microsoft site.
you can add Chrome to the keychain ACL.
Deleting the login.microsoft.com keychain entry SOLVED for me.