Hi @Colin Ferguson ,
If you want to change the subscription owner, the user should be the role of System Administrator.
The System Administrator role is a predefined role that includes tasks that are useful for a report server administrator who has overall responsibility for a report server, but not necessarily for the content within it.
For reference:
Please remember to delete the accounts no longer using in the system role level and predefined role level.
Also check that the old domain account has been removed from the Administrators Group.
Regards,
Zoe
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