Recently, Google introduced a new system for accessing Gmail emails. You are now required to validate your access every few months. If you don't, the connection to Automatic Email Manager will be reset.
You will receive an email from Google asking you to renew your access. When you click on this email, you will be redirected to a Google page:
If you want to continue using Automatic Email Manager with your Gmail account, simply click on "Renew access." That's all you need to do.
Or if it is too late, you can edit the account in Automatic Email Manager, move to the step 3, click on 'Reset authentification', then click on 'Sign in with Google'.
