Hey there, kbsf!
I can definitely understand why you'd want your Activity data to sync from your workout apps. Being able to track your progress is important! Let's take a look at this together. To start, you mentioned that your permissions are as they should be, are they also set up within the apps directly?
For ClassPass, you can check by using: Fitness Tracking on ClassPass
For the MINDBODY app, I'd recommend reaching out to them directly to see if there are any steps they can provide to help with syncing.
Use the Activity app on your Apple Watch also has some great tips to help you track your activity once those begin syncing.
I hope that helps!