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Chris Parker's avatar
Chris Parker
Iron Contributor
Jun 15, 2022

"Deserialization fails" during Hybrid Deployment Check

Hello,

 

I'm trying to install Exchange 2019 CU12 on a new Server 2022 but I get an error during the Hybrid Deployment Check after I put in my AAD credentials. Yes, the user is in the Organization Management role.

 

The beginning of the error reads as: "Deserialization fails System.NullReferenceException: object reference not set to an instance of an object" (full text cannot be copied; screenshot is below).

 

For a little more background, I have Exchange Server 2013 in hybrid mode that has been in place for several years. I wanted to clean up that server so I installed another instance of Exchange Server 2013 that co-exists. I started moving some mailboxes but decided to bite the bullet and re-up my Exchange licenses so now I'm moving on to 2019.

 

I don't believe the 2nd 2013 server is causing this issue but only because I didn't see any indication of that in the documentation (not that I read 100% of what's out there).

 

I believe I am meeting all the prerequisites. What does this mean?

 

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