InvalidOperationException: The converted JSON string is in bad format.

For UnitySync v2.8 and higher, Powershell v5.1 is required.

If an older Powershell is in use, the following error may occur:

Query Error : 10/27/20 08:34:13
——————– Get Contacts ——————————————–
InvalidOperationException: The converted JSON string is in bad format.
————————————————————————————.

Refer to the following articles for further requirement information:

Office 365 System Requirements
UnitySync Office 365 login requirements