Business Rules Not Executing

I am attempting to use business rules to assign newly created requests to specific technicians based on site and category. None of the new requests are being assigned to any technicians.

All requesters are assigned a site and department.
Category is a required field in the default incident template.
The only incident template is the default incident template.
There are four sites.
Every site has only one business rule.
All four business rules have "Execute when a request is Created, Any Time" enabled.
All four business rules have "Turn on cascade execution" checked.
All four business rules have "Override request values with Business Rule values" checked.
All four business rules have "Disable Business Rule" unchecked.
All four business rules show the correct site in a field that cannot be edited.
The business rules each have one criteria and one action.
The criteria for each business rule is "Category is Tech Support"
The action for each business rule is "Assign to Technician [technician name]"