Skype Business Client can't sign into Skype for business

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On Premises Skype business server 2015 , was working perfectly since last two weeks users are getting sign-out ( all users almost same time)  with error message " Please signout at another location and try again you have reached the maximum number of computers or devices allowed " . We are having S4B front end and Edge And ISS Reverse Proxy. all running in Win 12 R2. During this period there is no specific changes in System. AD running win 16

on clients, we are using Skype for Business Basic which is part of office 365.

users are getting loout not any specific interval, some time in a hour or 2 hours 


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