Syncing device iMessage issue

I have an iphones XR and a iTouch. i do not own a MAC. I set up iMessages (both devices are using this) to sync between the iPhone and iTouch via iTunes. The syncing works fine, however texts sent to the iPhone from an android user is readable in iMessages on the iPhone but not syncing and viewable on the iTouch. Only texts from Apple devices syncs to the iTouch. How can fix this or what is the go around please.

Thanks.