Well, you say it isn't on Do Not Disturb. The issue I had was that there are a number of icons on the status bar, and your video is so far away they cannot be seen. Don't bother recording another video. Do you have any forwarding turned on, such as phone forwarding, or do you have text message forwarding turned on for either device? It isn't that I don't trust you, I'm trying to see everything turned on. Can you provide a screenshot of the problem phone? You can redact any personal information.
What troubleshooting have you tried? Are both of these devices iPhone 8? Were you doing anything of interest when this behavior started?