I set up a wireguard tunnel on my wAP ac LTE router via the back to home app. I can connect to the router with my android phone and access the LAN devices behind the router. On my WIN11 laptop I can connect to the wireguart tunnel but I can only ping the LAN devices but I have no access to the config pages of these devices which works on android.
Problem solved with this post: http://forum.mikrotik.com/t/wireguard-android-to-os-connects-but-no-access-to-lan/177488/1
Changed the WG MTU to 1280.