Deep-link call in MSTeams custom app works on desktop BUT FAILED on iOS and Android

Hi All,

Our application provides the facility to make call between contacts.

To start communications, we have used deep links.

These deep links are working fine on desktop and chrome clients.

But when same application is running on iOS or Android, It always fails.

users to make deep-link call mailto:raju.panwar@Agnity263.onmicrosoft.com.

I also tried by converting it in small characters but same issue persists.

When start executing deep link, It displays avatar and display name correctly in desktop application when call is working fine.

BUT when call is failed, it displays avatar and known user.

How can I fix it?

Please suggest.