new error, exchange online/2010 hybrid


I can't find this issue any where else, so i'm starting here : I have a user, was migrated months ago to Exchange online, checked his license, its OK. 

He was out for a week & came back to problems displaying mailbox folder.

UPdated the outlook client on his machine & cleared sign ins. Now he get's this "a  problem occurred during sign-in for To solve this problem, go to in your web browser. Do you want to open the webpage?" The extra slash is as found, but the names and domain changed for the innocent.  I can upload a screen shot, if anyone's interested. I've tried a new machine, recreating the outlook profile, and resetting any hints of active sync history in the ECP on exchange online.

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