I needed to make a change to our Hybrid configuration when the following issue was encountered: Subtask CheckPrereqs execution failed: Check Tenant Prerequisites
After multiple attempts to run this and troubleshooting. I find out that the issue was caused by recent changes to Exchange Online.
The first KB informed me to remove an invalid certificate
KB2772596 – http://support.microsoft.com/kb/2772596
The issue still existed after after the removal, I later found the following: KB2988229 – http://support.microsoft.com/kb/2988229
Its time to run a cumulative update (CU). In my case I will need to be at Cumulative Update 5 for Exchange Server 2013 (KB2936880)
If you are unsure what version of exchange you are currently running you can use the following Exchange Powershell Command:
Get-ExchangeServer | Format-List Name, Edition, AdminDisplayVersion
Here is a table for reference below
| Product name | Release date | Build number |
|---|---|---|
| Exchange Server 2013 CU5 | May 27, 2014 | 15.00.0913.022 |
| Exchange Server 2013 SP1 | February 25, 2014 | 15.00.0847.032 |
| Exchange Server 2013 CU3 | November 25, 2013 | 15.00.0775.038 |
| Exchange Server 2013 CU2 | July 9, 2013 | 15.00.0712.024 |
| Exchange Server 2013 CU1 | April 2, 2013 | 15.00.0620.029 |
| (RTM) Exchange Server 2013 | December 3, 2012 | 15.00.0516.032 |
2 replies on “Error: Subtask CheckPrereqs execution failed: Check Tenant Prerequisites”
I have found a KB which describes the symptoms I have faced. I have once again reached out to Office 365 Support – http://support.microsoft.com/kb/2988229
Following up via comments:
I got a response to address the HCW Serialization Error
It looks like I will need to now update to CU6 as per http://support.microsoft.com/kb/2988229
http://support.microsoft.com/kb/2961810