I haven't been receiving any game alerts for hours despite continuously setting them.

Known not working: ice fields, crypts, random, mallarchy pond, scratch card, reflection, Subeta tiles, fishing

I think I can confirm that this was a lag issue. I saw your post at 10-11 ish, realized I hadn't done pet training or random in several hours, and then set them again. 20 minutes later I actually got the notifications, just extremely late and after I had already done them.

It actually appears that it may have been been resolved, as I actually just got a notification that was on time., though I'm not sure

Edit: literally seconds after making this post I got a notification for random so I think it's fixed?

Seems fixed. I got ALL the alerts at once (multiples of each from resetting them over hours) so whatever was backlogging them let them through