This may be nitpicking. But I don’t always get the tribute alert when it’s actually available. Say it’s ready at 5 pm. If I don’t pick up my phone until 5:05 pm then I won’t get an alert until then. There’s no rhyme or reason for it. Sometimes it triggers without me touching my phone. Other times it gets delayed until I do.
I can have the game running on my phone while it’s locked or GoW completely closed down. It still happens.