When using Restream.io to broadcast on multiple platforms, a bitrate higher than 3500 can't be used or it just doesn't work.
I recommend adding guide or pop-up prompt that explains that.
I've spent three days trying to figure out why it wasn't working. It will save others a lot of headache to know they've just got to bring it down to 3500. =)
Jackals Den commented
I also havent seen anywhere in any kind of documentation that 3500 is recommended for Beam, or even that it is capped at 3500. If it is in fact capped it should be noted. I only heard from another streamer to use 3500 and have passed that info along.