Change Service Provider action not showing all the available carriers

Summary:

We have buy shipments created from Order Release which is created from Quote and shipment is secured and enroute_enroute but now user wants to change service provider so we have created rate record and added lane in rate service and in rate inquiry it is showing the rates but not in rate and route but the rate record which is already assigned to shipment is also not showing in rate and route during rate inquiry

So what can be the issue with data or configuration?

Content (please ensure you mask any confidential information):

We have buy shipments created from Order Release which is created from Quote and shipment is secured and enroute_enroute but now user wants to change service provider so we have created rate record and added lane in rate service and in rate inquiry it is showing the rates but not in rate and route but the rate record which is already assigned to shipment is also not showing in rate and route during rate inquiry