LAN not working on multiple platforms

My son and I play Minecraft together. There has never been an issue with us connecting over LAN, me being on a Windows 11 pc and him being on an Amazon Fire kids tablet, running OS 7.3.2.6 (we play using the same Windows/Mojang account). My computer is connected via Ethernet and his tablet Wi-Fi, but the same network, nonetheless. The LAN games worked from the first time he downloaded the game ( a few months ago). Then it just stopped working yesterday, with nothing seeming to change. The strangest part is if he creates a world I do not see it under the "Friends" tab where the LAN option shows up, but if I create a world he does see it under the same "Friends" tab with LAN and can join. We both have the same version of Minecraft, and I have tried other troubleshooting options; restarting the computer and tablet, uninstalling and reinstalling the game on both systems but nothing has changed. It is baffling because the LAN literally was working one day and didn't the next.

Thank you.