Amend or not

We paid IRS $948 on 03/13/21, based on Turbo Tax calculations.  In first week of April, we received a CORRECTED 1099G from Arizona Dept. of Economic Security showing a higher Unemployment Compensation amount.  Opened Turbo Tax file to file an amended Federal return.  Total amount due to IRS has changed from $948 (02/15/21) to $278 (04/10/21).   Is amended return still necessary?  Why didn't Turbo Tax email us us re the change in amount due?