Hello,
Welcome to our Microsoft Q&A platform!
There are many ways to achieve this function.
One method is to use firebase to develop a real-time chat application
We can store user chat data in the Firebase Realtime Database, where we can sync data with a NoSQL cloud database.
For this ,you can refer article Building a Real-Time Chat App with Firebase.
And if we enter keywords how to development a chat app in xamarin forms
in our browser, there will many relative tutorials about this.
Best Regards,
Jessie Zhang
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