Looking at the error in the screenshot, it seems like there is an authorization issue on your Gmail settings. This could happen for two reasons:
- If you have recently changed your Gmail password and did not update in Email Preferences.
- If Allow less secure app option is on your Gmail account.
You can fix the first one by updating your email preferences in Method with the new password.
You can turn off the Allow less secure app option in Gmail. Here is an article that can help with that.
If this doesn't fix your issue, please give us a call on our support line 1-888-925-6238 x2 for support and we can help you with that.