Hey nemi18,
Thanks for using Apple Support Communities. Your description shows you have iOS 17 installed. If that's the case, you'll want to reach our developer support to file a bug report. Here's more information, just in case: Bug Reporting - Apple Developer
If instead you have iOS 16 installed, these steps can help:
- Ensure both devices are updated. If an update is needed, back up first: Update your iPhone or iPad - Apple Support
- You mention restarting one iPhone, be sure to restart both of them and your Wi-Fi network to see if fresh connections help to resolve this.
Keep us posted on the results.
Take care!