Former Lync install, now S4B. Largest bulk of accounts have gotten S4B entitlement show up, and can connect.
SOME (1 in 8) will not show up in skype admin regardless of every variation i have tried. these are of course the most important ones to get moved over...
[they generally seem to have been former users of an ON-Premises Lync install, but NOT ALL are.]
I have switched license types, to test. Have looked at AD record to see if there is a value there that may preclude applying a license but have not found it. Created test users that work. plenty of open license spots as well.
This is not intended to be a hybrid install. desire completely moving to S4B and purged all the old DNS settings from that install.
All thoughts and theories are welcome