Hello Snehi,
May be checking as below might help in knowing model is assigned or not.
If its not assigned you can assign here by clicking on Assign Model and give the Model Name and Version. This should resolve the issue.
Sample ->
1. Please navigate as below.
2. Give the Technical Service Name and click on Display.
if the Model is not assigned you will see the below details ->
Now click on Assign Model button and specify the model name.
if the Model is assigned you will see the below details ->
Regards,
Ashwin