I’ve found that once some of my alts get to 80 renown I no longer get grateful offerings from the dailies in the covenant sanctum. For instance, yesterday I did 2 of the quests on this alt character and didn’t get anything. I read on the FAQ list that sometimes these dont update right away and logging off and on will fix it. I closed the game yesterday and came back today with no update.
Weirdly enough, I dont even think it’s to do with the fact that the alt is at 80 renown. I have another character that I tested today who’s at 80 renown and they got their grateful offerings. So the only consistent metric I have right now is that it happens on only some of my alts that reach 80 renown.