SurveyURL is blank in Internal Survey email

We have SM 9.50 which is newly installed and upgraded to 9.51.

We have configured internal survey once interaction tickets gets closed in SM.

 

Getting internal Survey on mail however URL against Survey field is coming blank. Attached screenshot of the mail. 

Kindly help to trace why URL is blank and also share survey configuration steps in SM which I will verify with I did.

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