When you troubleshoot issues in which the system is not importing email from Google® email accounts after upgrading to WHMCS 8.6 and modifying the support department settings, you may see an invalid SASL argument error:

last request failed: invalid SASL argument

The Mail Import test failed: Oauth2 auth failed, BAD Invalid SASL argument.

Some of the required information for POP3 email importing via the Google OAuth2 authentication method is missing.

Execute the following MySQL® query against your WHMCS database. You can do this using the SQL tab in phpMyAdmin:

UPDATE tblticketdepartments SET login = '[email protected]' WHERE name = 'Name of Department'; 

• Replace [email protected] with the email address of the Google mailbox.
• Replace Name of Department with the name of the support department.