Like others SC products, you need to register the sdk service account that run OM services in your OMS with setspn to work correctly.
The syntax to execute are below:
setspn -S MSOMSdkSvc/OMS.domain.fqdn.com domainnetbiosname\SVC-SCOMsdk-PRE
setspn -S MSOMSdkSvc/OMS domainnetbiosname\SVC-SCOMsdk-PRE
To see if you did ok, use setspn -L SVC-SCOMsdk-PRE
If you want to know more about SPN for SCOM I put here a good article from Kevin Holman.