Cannot login from MAC OS X

From a MAC OSX 10.11.2 (El Capitan) with latest patches at time of writing, I cannot login wit my Microsoft account.
I did perform a password reset once but no joy, still the same issue.
By reading other feedbacks on the Internet, it seems MAC OS X is not first priority for MS engineers: a shame… I’m a MS Band2 client, and although running OS X I think they are many people that are impacted.
Now that hte Xmas freeze is over (almost) I hope it will get fixed.

Thanks and regards,
Pascal

Petite_Goutte about Microsoft Band Sync, v1.3.11208