Hello @Lenz_vD94 ,
Thanks for reporting on this issue in our community.
1. Please use your phone or laptop to connect to the EAP’s Wi-Fi. If you can see the error message “Obtain IP address fails”, or the phone can connect it but the IP address is 169.254.x.x. It is because the connection between the router and EAP fails.
If you are not sure, please use a PC to replace the EAP, connecting with the same Ethernet port and cable to check if the PC can get internet or not.
How to find IP address of Android smartphone/iPhone/iPad
2. If you can get a valid IP address, you can do the Ping test on the PC, Ping the router’s LAN IP, ping the 8.8.8.8
Here is the instruction for the Ping test.