Your backup has not completed recently

I keep getting the message Your backup has not completed recently, when there was no backup due or a backup was completed a day before as scheduled.

This same issue was posted already on 28 January 2022. Would appreciate it very much if a recommendation would be posted about how to stop it. Thanks.

FWIW ~
my Backup Settings -> Backup is On
my Manage Backups -> Configure -> When are Manual Schedule.  

Norton prompt ~once a week "Your backup has not completed recently". 
I'll run Backup, at that time.  Norton is quiet until next week.