Can't connect to cloud atlas from my Cpanel

Hello everyone, so i’m trying to launch my website on my Cpanel but can’t quite manage to make it.

here is the error it gives me :

MongooseServerSelectionError: connect ECONNREFUSED

I already opened the PORT 27017 for this IP ( ) on my Cpanel but it still doesn’t work.
I already allowed all IP’s on my cloud atlas as well.

I actually don’t know what else to do here

If someone has ideas, it would be wonderful, thank you !

I forgot to add, that in local, everything is fine.
Sorry for the double post