Hey daphnissov,
I've run through all the services looking for "long on as" type entries and also scrapped the task scheduler for any non-system tasks (found 2, 1 VMware based task running different creds and an audio driver), no luck there.
I noticed that the datastore that is listed in the error is not available on the server, from the layout of the name I'm assuming it is one of the handful we deleted about a week ago. Are there any known issues with outdated datastore addresses and login auth errors?