Waiver of late fee- from July 2017 to Jan 2020- How to claim

How to claim the late fee waiver as per the notification in respect of the past returns? Is GST online returns updated as per new notification?

Further, yesterday was last date to file returns for Feb 2020, However, I could not submit the same because I could not file previous month's returns due to late fee waiver scheme. Anyone knows any solution for the same? As it looks like, late fee will become applicable for the returns pertaining to Feb 2020 now.