I contacted Brostrend on this issue and unlike Tim I had a fast response and finished up with sharing my screen and letting their tech team sort it out. God knows what they did because my screen disappeared but I got an e-mail a few minutes later which said "The problem was a bad /etc/apt/sources.list.d/raspi.list"
The dongle now works. Although I have no idea what their message means it may help someone on here that understands Linux better than me to sort out their problem.

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