The customer is unable to schedule a clone request and receives the error message "instance <instance_name> is pending a clone source request and cannot be overwritten. You must cancel or wait for existing clone requests to complete before submitting any new requests."
The most likely scenario for this error is described here:
- You want to clone instance A (Prod) over instance B (Test)
- A clone record already exists in 'requested state' to clone instance B (Test) over instance C (Dev).
So the fact that instance B is scheduled as the clone source for a future clone, prevents it from being cloned over.
Cancel the existing pending clone record or wait for the existing clone to complete.