Challenge
Despite everything seems to be normal in Veeam Extension Services, the Veeam Collector log does not contain errors, and file OmTopology.xml is created in the Collector installation folder, Veeam views in SCOM are empty.
OperationsManager logs on the Collector server contain events 999, with the following message:
Error Loading XML document C:\Program Files\Veeam\Veeam Virtualization Extensions for System Center\Collector\Log\OmTopology.xml - No data is available for the requested resource.
Cause
Run as account Default Action Account (default Monitoring Agent Action Account) does not have permissions to read from the location where the Collector is installed, typically C:\Program Files\Veeam\Veeam Virtualization Extensions for System Center\Collector
Solution
You should either add permissions to read from Collector installation folder for the SCOM Run as account or add this account to the local administrator group on the Veeam Collector server.