Welcome to the ODK forum, @Naresh_Swargam! We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!
I'm sorry to hear you are having this problem. Collect should be backward compatible with much older versions of Android than what you mention. Please answer some additional questions to help troubleshoot.
- What is the Collect version that is running on the phones with the error?
- What is you version of Central? (You add
/version.txt
to the end of your URL to find this. For example:https://myCentralServer.org/version.txt
) - You say Android version less than 10. What version of Android?
- The icon to the right of "Start new form" shows a sync error. Are there any error messages that you are shown in the app?
- Are the phones with the errors on the same network for internet access? Are they able to go to websites and use other apps that require an internet connection?