I have a similar problem with 2 accounts. I see 2 titles listed during license check, and bind / unbind option but, for the 3rd title the key is activated but shows bound to another account and no option to change. This 3rd title is A10C that I bought from Amazon, not through DCS. Also, when in multiplayer for DCS World I see plenty of servers listed for that account but, when in A10C multiplayer on that account I see no servers listed.
Please help.