iOS 17 fitness app custom plan error

hello! I have the latest developers version of iOS 17 and I am trying to create a custom plan in the fitness app but it will not allow me to click the "create plan" button at the very last page of that process. everything else seems to be working fine but I was able to see people like iJustine and people being able to make it so I'm wondering how they were able to do it. Ive tried restarting my phone, checking for the latest updates but nothing has worked. If you can help me, that would be great!