I'm happy to see that VVX UC Software 18.104.22.16847 has added the feature to Sign In Remotely Using Web Sign-In for Skype for Business. I've tested it with my own phone and works great.
Is it possible to perform the Web Sign In to a VVX phone configured as a Common Area Phone as well? (When doing this from the phone, it requires enabling the Common Area Phone feature and then choosing the "Web Sign-In (CAP)" option from the menu, and entering that code at http://aka.ms/skypecap.)
When I go to the http://aka.ms/skypecap site I don't see any phones. I am currently testing the feature in preparation for moving my CAP's from on-prem to online so I only have one phone currently with the CAP license. I can see it in the Skype admin portal but not in the link mentioned. Any ideas why?
Make sure to uncheck "Search for Common Area Phones only" when you perform your search. I have no idea why that checkbox is there or what it is actually supposed to do, but it needs to be unchecked in order for the search to work.