Skype for Bussines

Occasional Visitor
Good afternoon, I am responsible for IT in a company and the message below started to appear to two users. 
I have already reconfigured the IP, checked my password and login and everything described on the Skype for bussines support site,
but I was not successful.
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Has anyone gone through something similar and knows how to solve it?
 
 
 
 
 
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