The SQL Server Agent on the SQL Server hosting the SSRS instance isn’t running. Therefore the ‘scheduled operations cannot be created’. These scheduled operations are scripts and the lot which are part of the OM12 Reporting installation.
Start the SQL Server Agent on the SQL Server hosting the SSRS instance and the installation will run now.
For myself I haven’t seen this issue because when I install the SQL server required for SCOMR2/OM12 I always set all SQL related services to start automatically. This has saved me the above mentioned issue.
But I can imagine situations where the SQL server is already provisioned by the DBA’s. In that case ask them to set all related SQL services to start automatically.