@Proxxy Did you set the AX10's correct MAC address in the ER605 address reservation table ?

@Proxxy Don't worry about this error message. I have pretty much the same logs in my C64 in AP mode but it works fine.

@Luca5chv What's your current FW version (you can see that in the RE web interface System Tools menu) - if it's not the latest you can update the FW - here. The problem could be in you Huawei router...

@Luca5chv How about your laptops and mobiles are they move between the main and EXT SSID without issues ?

@Luca5chv Set the RE with a static Ip address 192.168.1.254 not 192.168.1.54. Then do the restart procedure for both devices again.

@BrainEnergy Bandwidth control for guest network allows to set a limit for the whole guest network, not ian ndividual client devices - here's a guide which describes this feature.