Community Moderators ensure that conversations are friendly, factual, and on-topic. We're here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Welcome to the Forums @MIA_16.
Let me help you get your Alta HR to sync with your P20 Pro. Thanks for sharing the details of the situation.
To answer your question, the P20 Pro is definitely compatible. What I'd recommend that you try to follow the steps listed in this help article. That should definitely help in getting everything to sync again.
Keep me posted on how it goes or if you have any further questions.
Best Answer