Hi!
We have deployed Skype for Business (on premise), and the Skype connectivity is working flawlessly when Skype users are using a Microsoft Account to sign in.
However, when Skype users are using a Skype ID to sign in, we are experiencing issues, where we can Contact the Skype user, but the Skype user cannot reply.
The Skype user is not seeing the Skype for Business user as online, and in the chat field the message: "Messaging unavailable" is displayed.
The Skype client is version 7.6.
Is it a REQUIREMENT to have Skype users signing in with a Microsoft account to provide connectivity with Skype for Business users?
Best regards,
Michael