My Android does the same thing with the FLY app and the stupid part is when I go to login it shows me logged in. I have to log out then back in. This has been going on ever since I got the drone reguardless of the OS or the FLY version. Uninnstalling and reinstalling doesn't help. Dji has been no help in fact my emails to support go un-answered. It's just one more reason I will never buy another dji product.
The Go4 app is written for mobile devices, such as phones or tablets, not impractical in the field 27”Mac’s. I suggest that you look for the program “DJI Assistant 2” for to use on a Mac or PC with the Mavic Pro at a desk. It is used more for preparing the drone to fly or for interrogating logs. Mildly hacked versions can also be used to change flying parameters outside of DJI’s limits.