Thank you so much for your response Charles, however your instructions did't work. I researched a number of other solutions, but none of them worked either. I was unable to find any of the settings on my iPhone. BTW, I also contacted Apple Support who screen-shared and they couldn't figure it out either ! I ended up turning the volume all the way down so I didn't have to hear notifications all day - even that didn't work.
This is FYI only, and nothing further asked of you. Hopefully, this issue may resolve itself after the new roll-out starting on Tuesday.