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Incomplete iMessage Setup: It may be possible that you let incomplete iMessage setup cause reason, First complete the setup and verify yourself then try again.iMessage Server error: If you were sending a message while Apple was upgrading or in Maintenance you would receive a server error but it just for a couple of minutes, Wait for some time and try again.iMessage and Message need an active internet connection to function, at least once try to connect with Wi-Fi, Ethernet, personal hotspot or any medium of functional internet connection. Internet connection issue: Your connectivity could facing an unstable internet network, and try again.Outdate iOS app: the Sometimes app comes with bugs and crashes, which might be fixed with the latest update patch.
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