After I followed the steps of "Multiuser Mode" in the DJI Goggles user manual, I found that the "Set Max Flight Altitude" setting is set to 0. If I change it to any other value, it will just change back to 0.

In the remote controller setting, the remote controler is linked as "Primary VR Goggles Remote Controller".

Can someone please advise? This is very frustrating after I bought 2 sets of goggles hoping to use them at the same time following the multiuser mode instructions. Now I can only use 1 set of goggles with the remote controller without issue.

Are goggles connected to MP?

Yes. There is no problem with connection. Per goggles user manual, the steps are to connect goggles to MP first then connect RC to goggles. All got linked just fine except some settings can't be changed.