Thanks for your reply @Kevin_Z The main router's IP range is 192.168.2.X, this is what my devices get normally when connecting. The laptops/devices get an IP address prior to being asked to input the...

Is there anything I can do to troubleshoot this logically?

I'm renting accommodation where the landlord has an unsecured portal for networking, and in order to operate on the network a password is entered on the portal page that pops up when you first...