Cross Post SCOM 1801 Upgrade Pitfall With SCOM Reporting Instance
Got this one from the blog of Robert Bird, senior Premier Field Engineer for Microsoft UK. So all credits go to him.
When updating SCOM 2012 R2/2016 to SCOM 1801 you MUST install the SCOM Console (the UI, not the Web Console!!!) on the SSRS instance (the SCOM Reporting server) FIRST.
Otherwise the upgrade of the SCOM Reporting instance will fail. And installing the SCOM Console AFTERWARDS (when the first upgrade has failed) and rerunning the upgrade won�t do.
Go here for the original webposting.