Hi @Timmahh, thanks for reaching out! You also need to add Asana in the Microsoft Intune admin center. See instructions for iOS in the article below:
If you have already followed that steps and the issue persists, I recommend you to contact our support team as they will be able to give you more details around requirements and additional settings: How to contact our Support Team ✉. When you contact them, feel free to share the URL of this thread so you don’t need to repeat all the information.
I hope this helps! Let me know if you have any other questions.