WhatsApp messages are not arriving
Business API — in the great majority of cases the webhook field subscriptions on Meta are missing. Then: the Verify Token on Meta has to be identical to the one generated by Talkzen (different for every connection); use Test Webhook Configuration; check that the token is not the temporary 24-hour one; check that the number is in live mode and that Meta has not limited the number's quality rating.
QR Code — the phone has to be switched on and online, and Talkzen still has to appear under Linked devices in WhatsApp. Another session on the same number closes the previous one.
Did not find the answer? Write to support@talkzen.io and tell us what you were doing and what you expected. If it concerns a conversation, the time and the channel save us a round of questions.