Could not start executor. Access is denied - Service mode unattended robot

Hi everyone,
I have configured an unattended robot in service mode in Cloud Orchestrator. After connecting the assistant to the machine through URL and machine key, I can see the robot in Cloud Orchestrator with the “available” status and the green dot. Up to this point, it seems that’s all correct. But when I try to run a process, the job faults with the following error message: “Could not start executor. Access is denied (#1680)” Input Values: NULL Output Values: NULL. Username and password values for the unattended robot are correct, but stored in Azure Key Vault type Credential store and not into the Orchestrator database.
Any suggestion?
Thanks in advance.
Best regards,

Hi !
In this post several options are given, even if it’s not exactly the same error message, maybe there is something that gives an idea of the problem ?