Messaging problems

• WhatsApp disconnected or quality droppedReconnect a number whose Meta credentials stopped working, and understand the High, Medium and Low quality labels.
• Why broadcast messages failed to deliverFind out which contacts a broadcast did not reach and why: opt-outs, templates that are not approved, and numbers not on WhatsApp.
• I cannot send a reply to a customerWhy the message box may not let you send, and what to do: the 24-hour window, templates and connection checks.