You should be able to type in the URI and paste the join meeting link when you go to "Meet" on the client. The other thing you need to do here is to hit Enter and it should resolve to the name of the meeting space. So when you are at the Start or Join Meeting page after clicking on Meet, put the URI in the input bar and hit enter. If the URI is there, it should resolve to the name of the space and you should be able to join. I'm not sure if this is what you are doing or not, but give it a shot. If so, may need to see it somehow on what you are doing cause if the URI doesn't work, you can always do the same with the meeting invitation to as well, just hit enter after entering it and it should resolve to the name of the space and you should be able to join.