On your environment, do you have any approval process created and active?
If yes, can you share it here?
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Common reasons for this
1. The initial submission criteria, make sure you have record creater , this would be in approval process
2. You have validation rules for staff which uses ServiceDesk staff = true, conditions are not met
3. You have process build or automation, conflicting and getting to 101 error " Too many SOQL queries: 101 " Your guide to Troubleshooting!