I've had the same problem for a few days. Usually when this happens (not very often), rebooting the BI PC (Win10 Pro) fixes it, but no help this time.
My log said "Push: failed 80090328 to iPad; check security exemptions and service Login". My alerts go to both my iPad and iPhone normally. Since both devices have had Apple updates pushed recently, I rebooted both devices,
I'm running BI 5.9.3.4; I don't update often when things are stable. Both iOS devices have BI app version 2.04.06, so that hasn't been updated recently according the App Store.
The last alert I got was Monday, 4/21, 8am, which is when one of my cams auto-reboots to fix other issues. No more 8am alerts since then, and no alerts on the mailcam I usually get alerts on when a package or mail arrives.
Windows installed an update on Tuesday, 4/22, 7:45 am, with a name including WINDOWSALARMS. A few hours after that was my first manual reboot when I realized the alerts weren't coming through.
It's starting to look like the Win10 update may have caused this. Edit: The Win10 OS build is 19045.5737.
Anybody else having problems with push alerts on Win10? Do I need to update my BI version to work with this Win10 update from earlier this week?