Ghost Bunnies,

Welcome around

I'm not too sure of Gmail MfE giving issues previously but two things you may want to try.

Firstly, check the box for Non-Provisionable device to yes. Secondly, maybe try using the app MeMailSettings to change the exchange protocol as Exchange protocol 2.5 worked for hotmail.

Lastly, you may want to post the logs and also the exact error you get i.e. when you click on transfers and your failed sync account it would give you the error. Maybe with the last two, Sergey_Kashin can help you out