S4B missed chat conversation subject line is having incorrect email address

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We are using S4B online. 

We recently observed the missed conversation in skype for business is showing incorrect email adress with unidentified format.


Missed conversation Subject line Sample : 


Missed conference with Karthik Sundara (SEIT), sippooldb41e12.infra.lync.com58395565-e0c1-4d2a-9c29-27602d588068@online.lync.com, Moorthy Urkavala (SEIT), 44da120c-2f10-4df5-9bff-5a9cace3f559@anonymous.invalid


Do we have any idea why its happening and we observed in recent days that is happening for group chat and occuring more users.

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