Hi everyone,
I had this error myself. I fixed it by provisioning my robot in Orchestrator with full domain\username instead of just username in this field.
So, this was not working:
But as soon as I changed it to this, it started working again without the error message:
You can get the exact value of domain\username with this command in the command line:
Please let me know if it fixed it for you! It seems like in the past Orchestrator would accept just the username (in some cases, it was not the expected behaviour ), but it stopped working since 2019.2 (which is a good thing! )