An unknown error occurred - verification failed during login to App Store

Hi varunsk,

Welcome to Apple Support Communities. We understand that you're having an issue signing in to your Apple ID on your Mac. We'd like to help.

Have you ever successfully signed in on this Mac before? Are you currently connected to your home Wi-Fi or another network? Does the same issue happen if you switch networks? Restarting your Mac can sometimes resolve sign in issues. Have you tried that?

If you log into the Apple ID website, are you able to sign in successfully?

Let us know!

Hey there varunsk,

Thanks for keeping us updated.

Which macOS version are you currently running? It will be helpful to make sure you're on the most updated version to try and resolve this issue: How to update the software on your Mac

If you're already updated, or you're still having this issue after completing that update, Contact Apple Support would be the best next step for you.

Take care!