Check Your Account Settings in Messages. You can find these settings under “Messages - Preferences.” These settings control the connection between the Messages app and your messaging data associated with your Apple ID, phone number, and iCloud. Fix: Check your Mail Connections. Open the Mail app. Go to the Window in the top menu and click on Connection Doctor. This will show whether there are problems with connecting to the Mail app. Now re-check account settings and delete and re-add your Mail account to reset this. Your Mail app and every email should be accessible again.
When you first set up Messages on your Mac, you're asked to sign in to your iMessage account with your Apple ID. Messages then automatically attempts to sign in every time you open it. Signing in to FaceTime is similar. If either app doesn't sign in successfully, try these solutions.
Make sure that your Mac is connected to the Internet. You should be able to load web pages or receive email, for example.
Check the Apple System Status page for a temporary outage affecting iMessage or FaceTime.
Learn how to update your Mac software. Software updates can improve the stability, compatibility, and security of your Mac, and might also resolve the issue.
To make sure that your Apple ID and password are correct, go to the Apple ID account page and sign in with the same Apple ID that you're using with Messages and FaceTime. If that works, open the app and take these steps:
In case the issue is related to any of the settings stored in NVRAM, reset NVRAM on your Mac.
If you installed firewall, security, VPN, or other third-party networking software, make sure that the software isn't blocking any of the network ports used by iMessage and FaceTime. If necessary, disable the software and then try using your iMessage account or FaceTime again.
Learn what to do if you have other FaceTime issues.
FaceTime is not available in all countries or regions.