No I don't think you would NEED to receive a text before it works, I just noticed that as soon as I turned off HD Voice on the website my texts started coming in. I shut my phone off after I turned HD Voice off and turned it back on after I reenabled it.
Gotcha. I just tried both ways and neither worked for me
Run down of my experience so far:
1. Flash the US firmware 51.1.A.3.159 to my H8314 using newflasher. Goes fine.
2. Start up phone with my sim that was previously active on my Nexus 5x. Almost everything works (Data, VoLTE, sending texts), except receiving text messages does not.
3. Call Verizon, have them re-provision texting and reboot, no dice. Open level 2 support ticket.
4. Go to Verizon store and get a new sim. No dice. Also try re-provisioning texting in the store again, no dice.
4. Hours later get a call from someone at verizon that they've fixed it, just need to reboot my phone again, so I do, but no dice.
5. Call Verizon again the next day, have them do the VoLTE disable/re-enable, no dice. Apparently my support ticket is now closed.
6. Also try resetting the phone, even though it was already brand new, no dice.
Going back to my Nexus 5x for now, I need texting to work. I'll keep an eye on this thread, hopefully some new developments happen soon.