Issue: Trying to one or more management packs into Operations Manager and they are all failing?
Resolution: Check the free space on the OperationsManager database. There are alerts to provide warning if there is less than 40% available free disk space however if an OpsMgr environment is completely out of disk space all management packs will fail to import until there is sufficient free disk space. Best practice wuld be to increase it at least another 50% if possible since the database was already out of space and OpsMgr wants 40% for indexing.
P.S. Thanks to Blake and Anders who originally tracked this down/I just re-posted this as I hadn’t seen it happen recently and didn’t remember the cause until I found their discussions on the topic.