I had the same issues, mails/calls to customer care was useless (as they needed last 6 digit for card and expiry). In short, they even didn’t understand the problem statement.
I couldn’t find reason why it was blocked for me and many others were able to use
Once I got physical card, everything was sorted as I was able to provide them “last 6 digit of card”
Overall experience of P.N.B. onboarding has been horrible from 25L CIBIL hit for auto loan, multiple challenges in application, delayed delivery, and blocked e-card
All this, reminded me of ordeal I faced with PNB (10-12 years back) wherein I had to follow up for 2 months for a failed transaction refund