Generally status show pending when another job is running on same machine.
Just make sure other process should complete it’s run only then new process get executed.
Could you try to restart all of UiPath’s service(s) on robot machine. I’m experience this sometimes. Or restart the machine would help in some case.
Can you share for the robot version as well?
Go to Task Manager, Click on “Services” tab and search for UiRobotSvc and restart(or start) it by right clicking on it and selecting restart (or start) option
This usually happens in 2 cases - either process is running currently on that machine or robot/license assigned for execution is not in proper configuration which is why allocation is not being done.
Could you please check user/machine assigned to the folder has license as active under licenses tab at tenant level?