I have a Question about the OnePulse app channels.

I was looking through the channels in the app and saw that there are 3 of them that I am not able to join. They are Protein+3x week users, OPAMS, MKU Community does anyone have the channel codes for them? I'm level 16 and answer almost every single one.

Also was wondering if there were any other microsurvey apps or sites like this that only ask 1 to 10 questions?