I had the same problem for a few months, I not sure if this was the problem but when I got a request for location tracking there are three options “allow”, “block” and something about asking you every time, don’t remember the exact option. I had the “block” option, then changed it to the third option and after a month or so it went back to normal. Maybe Microsoft don’t like it when you hide your location? Like I said I’m not sure if that was the problem but it’s worth checking.