Skype for Business any SIP address you type @Mydomain.com shows as online

Occasional Contributor

We are running hybrid 2015 CU6 FH2 and SFB Online and for some reason, SFB  is showing available for any invalidupn@Mydomain.com address whether it is valid or not.even terminated users if type their UPN@Mydomain.com show as online

 

For example, invalid SIP address below showing as online:  

abc@mydomain.com

zyzzzzjfvlmdf@Mydomain.com

 

if you type any name like 123@mydomain.com it shows as it online.  Anyone else experiences this issue?

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