I’m actually not sure how to config the UBT to use the service account. If you can point me to that I will try.
I was able to get a different error message by copying the appdata oidcTokenStore.dat from a local interactive login to the system account appdata folder. Instead of failing on the attempt to interactive login it now fails with a
---- Starting trace: 250508_130038 ----
UbaServer - Listening on 0.0.0.0:1345
------ Building 3831 action(s) started ------
Unable to create Horde session: The system cannot find the path specified.