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When I am trying to delete a user  (mailbox user) I am getting error :

 

Input string was not in a correct format.

I tried to rest the SQL server service and also run IISRest still the same error.

Server 2016 act as DC
Exchange 2016 on the same server.
Solid CP 1.3.0 on the same server.

Please help,
Eran

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