Hello everyone, I hope you are doing well !!!

I've been dealing with these two errors for several days now ({ code: 131026,message:message undeliverable},{ "code": 131049, "title": "This message was not delivered to maintain healthy ecosystem engagement.." })

And these are specifics to marketing templates. I found in the documentation that these can be cause by message limit to the users or the users didn't opt-in to receive notifications from my business.

I found many ways to makes OPT-IN in the documentation but I don't undersand How does Meta know which users have opted to receive template marketing notifications?