Yeah, the sync toggle is greyed out in edge on my 930. Unable to do anything at the moment . Says u need a Microsoft or works account. I would imagine everyone who use windows will have an account
If you don't have an account, how does it recognize you over the web on another device? It's obviuos to have an account: for backup, cloud, OneDrive, sync, and disaster restore data saving
I'm logged into my phone and PCs with W10 using my Windows account. The toggle is greyed out with a red message below stating a MS or work account is needed, on the phone, 10572. There is no option to login to Edge itself. Does a similar Sync toggle need to be activated on a 2nd or more device with Edge installed? I don't see one in W10 RTM on PC.
You may need to do a hard reset (settings > system > about > reset). I wipes everything excep Win10 Mobile. You'll need to redownload all apps again. But doing the initial set up and putting in your MS Account info should resolve the Edge issue with MS Account. Or you could try logging out of your MS Account and log back in if you have not done so already.