Doing /team join [TeamName] lets me join the team but kicks me off immediately

Hi, I am having problems with /team.

 

Whenever I do /team join Owner it lets me join the team for about 0.4 seconds then kicks me off the team. Yes, I do have data packs, but they weren't the issue because it worked before 1.17-rc1 on 1.17 pre-release 5 even with all those data packs. Please help.

 

 

Here's what it does.

 

www_screencapture_com_2021-6-5_09_45.mp4