See as per the information available, the category certificate and the EWS certificate (if applicable) is required to be issued after 1st April,2021. Apart from that there are no such rules for the Domicile certificate to be issued after the prescribed date.

To know more about UPTU counselling visit the link below:

https://engineering.careers360.com/articles/upsee-counselling

I hope this answer helps. All the very best for your future endeavors!