Whitelist Automatic Sync
w hitelist the gmail automatic sync app from unaric sidebar these steps require admin access you may need to contact your google workspace administrator to enable this for you log in to g suite admin panel https //admin google com/ on the left panel, navigate to security > api controls on overview , click manage third party app access check if ienterprise mail sync app is listed if listed, hover the mouse over it to see the change access link and trust the app if not listed, click add app > oauth app name , search for ienterprise mail sync , and add and trust the app