On Android my expo app does not show notification (or they are receiving very late) after a certain amount of time (like 3-5) being inactive and the phone being locked.
As soon as I unlock the phone I receive the pending notifications right away!
When the phone is unlocked all notification receive properly and when I freshly lock the phone within the first 3 min (or so) the notification receive too. Just after being inactive, they won't show up.
I am not sure if this is some Android setting (this happens on Samsung A9 and Xiaomi Pocophone P1) or something I can set up in my app... On iOS it all works fine.
Do you have an idea what the problem could be? Other apps like Facebook, Instagram etc. work fine.
I figured it out. While sending the notification I had to set priority to high. see expo doc. Too bad nobody could help me with it. But I hope this answers the question for other people, if they face the same problem.