I think I’ve fixed it! The few things I could find online all mentioned making sure that the previous agent wasn’t still in the console. Using SquaredUp I was able to see that the server was still in the VADA map for the SCOM Management Group. I removed it from there, and also used the SCOM console Discovered Inventory to find a mention of it under ‘Health Service Watcher (Management Server)’. I put that in maintenance mode for 5 mins. Then I did a Remove-SCOMDisabledClassInstance and tried the install again, and it’s gone straight through. Happy days.
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