Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
It keeps sending me back to Microsoft account. I got subscription with google account
You can use a Google e-mail with a Microsoft account. The sign-in needs to be done in Microsoft's system anyway, assuming that this is in fact a Microsoft subscription.
Are there any clues as to what goes wrong? For example, have you perhaps set up two factor verification with the account?