How to access windows based remote desktop from Linux ubuntu with a known gateway hostname and PC name?

I often use my university’s high end Windows PC remotely on my windows 10 laptop. They have provided a bunch of rdp files (https://remoteaccess.labstats.com/Swansea-University) that allows me to connect me to a PC of my choice.

However, whenever I try to connect any of these PCs on my Ubuntu 20.04 LTS, I can’t simply connect. I have tried this on Remmina and several others.

Remmina allows to use rdp files directly but still doesn’t connects.

Here are the contents of the rdp file.

screen mode id:i:2
use multimon:i:0
desktopwidth:i:1920
desktopheight:i:1200
session bpp:i:32
winposstr:s:0,3,0,0,800,600
compression:i:1
keyboardhook:i:2
audiocapturemode:i:0
videoplaybackmode:i:1
connection type:i:7
networkautodetect:i:1
bandwidthautodetect:i:1
displayconnectionbar:i:1
enableworkspacereconnect:i:0
disable wallpaper:i:0
allow font smoothing:i:0
allow desktop composition:i:0
disable full window drag:i:1
disable menu anims:i:1
disable themes:i:0
disable cursor setting:i:0
bitmapcachepersistenable:i:1
audiomode:i:0
redirectprinters:i:1
redirectcomports:i:0
redirectsmartcards:i:1
redirectclipboard:i:1
redirectposdevices:i:0
autoreconnection enabled:i:1
authentication level:i:2
prompt for credentials:i:0
negotiate security layer:i:1
remoteapplicationmode:i:0
alternate shell:s:
shell working directory:s:
gatewayhostname:s:remotelab.swan.ac.uk
gatewayusagemethod:i:1
gatewaycredentialssource:i:4
gatewayprofileusagemethod:i:1
promptcredentialonce:i:1
gatewaybrokeringtype:i:0
use redirection server name:i:0
rdgiskdcproxy:i:0
kdcproxyname:s:

full address:s:WS-P1210334258