What should I do if my Google Workspace email domain changed?
To update your Google account email (both for your Missive login and for your connected email account), you should follow these steps:
If you use “Log in with Google”, log out from Missive then log back in. This will update your login email.
Just reconnect your email account (this admittedly isn’t very intuitive): open your Accounts preferences, click Add account > Gmail or Google Workspace, and select your same account. This won’t duplicate the account, it will only refresh the domain.