Did USCIS gave any relaxations if H1B petition is Denied in March 2020?

Hi Anil, thanks for posting.

Are there any changes or relaxations to the people whose H1B petition is Denied in March 2020?

There are no rule changes for H1B denial or extension or transfer or anything else.

The only relaxation has been given for RFE & NOID reply timings. It has been extended automatically by 60 days.

On the other hand, attorneys have suggested filing H1B to B2 COS application immediately if you cannot travel to your home country. Most countries have indeed blocked travel and you may be able to get B2 approved.