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biometrics validity letter
It is a letter confirming that the biometric submitted are valid for 10 years
It is issued close to approval date
 
An update: My brother got his passport call yesterday. However NDVO seems to be closed due to lock down in Delhi.

any insights on the stamping process please. What can be done in this case
 
An update: My brother got his passport call yesterday. However NDVO seems to be closed due to lock down in Delhi.

any insights on the stamping process please. What can be done in this case
What did you do brother?
Whats the procedure for stamping?