Hi @JuanVega
It looks like you have already covered the basic troubleshooting steps, which is great. Since the template is approved, your balance is positive, and permissions have been refreshed, this error usually points to a more specific sync issue between Meta and Manychat or a restriction at the Business Manager level.
One thing to verify is if the Phone Number Quality Rating is healthy, as a "Dropped" status could block outgoing templates even if everything else seems correct. Also, ensure that the WABA (WhatsApp Business Account) is fully verified and not under any temporary restriction.
If everything looks good on the Meta side and the error persists in both Live Chat and Broadcasts, it is best to have the support team look into the specific logs for your account.
https://help.manychat.com/hc/en-us/articles/14281086345244-How-to-get-support-from-Manychat
Hope this helps!