Port forwarding doesnt work unless connected through WI-FI

So I'm attempting to set up port forwarding for a personal Minecraft server for me and a friend to play on. i set up port forwarding for the game on my device through the app but it will only work if my PC is connected to WI-FI and it won't function or is blocked in some unseeable way when im connected through ethernet connection. is there is a way to do this without having to log into the router gateway? (forgot the login information to the 10.0.0.1 admin gateway to the router and i live with two older men i don't want to hassle with having to re-enter the passwords into every device they use after a factory reset to get access to that back)