BarryMc
Ohhh my…. I got some really bad news for you.
Your Ethernet-Setup only allows 100Mbit/s.
You’ll see that the green, red and blue plugs are different. Green and blue 4 lines and red one has 8 lines. This cable does split the signal.

The outlets are both hooked to the jack where the red cables are plugged in. One outlet is for ethernet the other for a phone. The cable is split on the outlets.
You should call your landlord and ask them, if they are willing to replace the outlets in the rooms, this way you can have at least 1Gbit/s ethernet. looking at the cable 2.5Gbit/s should be possible too.
Currently this part is installed:

And you would need parts like this:

Another Problem might be the front plate, but maybe not. I am not an electrician but we did discuss this problem in the community some time ago.