i can log in just fine on the the webpage but when i try to sign in to my iphones "roon app" it takes me to the webpage to sign in it works and just sends me back to the sign in page again
The most common culprit for login loops on iOS like you’ve described are content blockers/adblockers installed in your Safari Settings.
On the affected iPhone, please try temporarily disabling any content blockers for Safari, regardless of whether you use Safari as the default browser. Then log into Roon again.