Having a touble with MongoDB atlas connection on netlify deployment

this is my site :
https://smartthomee.netlify.app
have a problem in connecting to MongoDB atlas and this is the error from netlify log:{“level”:“error”,“message”:"Could not connect to any servers in your MongoDB Atlas cluster. One common reason is that you’re trying to access the database from an IP that isn’t whitelisted. Make sure your current}, i have added 0.0.0.0/0 to the network access in MongoDB atlas and still the same error , i have ensured the environment variables and the connection string

Sounds like an error coming from MongoDB Atlas than Netlify. They;'re refusing the connection, so they can tell why that would be than us.