In UiPath Assistant → Preferences → Orchestrator Settings → Sign out and Disconnect
In Task Manager close any UiPath Assistant processes and UiPath User Service
Open cmd.exe in the robot session → run whoami → get the value → provide it in the Orchestrator → Tenant → Manage Access → Edit the robot user/account → Unattended setup → Domain\Username
In UiPath Assistant → Preferences → Orchestrator Settings → change the Connection type to Client ID → provide the Orchestrator URL → Client ID and Client Secret of the machine template that has the Testing runtime
Thanks a ton @marian.platonov for coming up in call with me and solving this.
Resolution-
Signed out from UiPath Assistant → Changed the Connection type to Client ID → Provided the Orchestrator URL → Client ID & Client Secret of the machine template that has the Testing runtime