As of 2020, April 27th, I am having the exactly same issue in 13.4.1. I am testing on Ipad 6th generation 13.4.1, Iphone 8+ 13.4.1, and iPad Pro(12.9-inch) 13.4.1. Both ipads are connected to wifi and im testing my iphone on cellular with a sim card. When I first built the project from xcode in all of my devices, didRegisterForRemoteNotificationsWithDeviceToken and didFailToRegisterForRemoteNotificationsWithError didn't run at all. And when i reboot the device, it started to work again. I couldn't get exactly why this is happeneing. For iPads, the situation is worse because after rebooting the device it seems to work a little for a while and after sometime it stops working until i reboot the device again.
hititdev
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Did you find the solution for this problem?
Do your devices start to work after reboot?
Same frustration here.