Is this what you're talking about?
1) Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Inbox
3) Create a new key called "Settings"
4) Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Inbox\Settin gs
3) Create a new DWord called "SMSNoSentMsg"
4) Make sure its DWord value is set to '0'
5) Soft-reset your device
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