Troubleshooting Onboarding Messages in TightKnit: Need Help!

Hey! I switched over our onboarding message to TightKnit, but it doesn't look like it's working. For the new members yesterday, they did get a message from a different system we were using but it doesn't look like the TightKnit one went through? Which isn't necessarily a bad thing, I'd prefer for them to not get two onboarding DMs. However, I would think they should technically have also gotten the tightknit one this morning since it's been a day since they joined? What's the best way for me to troubleshoot this to make sure the new members get the onboarding DM?