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what about the validity of access token required to call MS Graph API's.
I'd try asking for help over here.
https://social.msdn.microsoft.com/Forums/lync/en-US/home?forum=graphde
Regards, Dave Patrick .... Microsoft Certified Professional Microsoft MVP [Windows Server] Datacenter Management Disclaimer: This posting is provided "AS IS" with no warranties or guarantees, and confers no rights.