Cannot assign users in xfinity app

bblank - You’re in the right place, and I’m here to help! Could you walk me through the steps you’ve taken so far and let me know where things aren’t working as expected? That way, we can figure this out together. Included below is a helpful article with more information on how you're able to manager user roles on your Xfinity account.
Manage user roles and permissions on Xfinity accounts