@Pawan Kumar Thanks for reaching here! As stated in this document- https://video2.skills-academy.com/en-us/azure/communication-services/concepts/voice-video-calling/calling-sdk-features
Outgoing Screen Sharing isn't supported on iOS or Android mobile browsers
Workaround- if you have native SDK for Android and IOS using raw media access. This basically means that you need to have native App on the mobile devices instead of the web browser.
Sample codes are available below:
https://video2.skills-academy.com/en-us/azure/communication-services/quickstarts/voice-video-calling/get-started-raw-media-access?pivots=platform-android
Please let us know if further assistance required here.