Failed to load resource: the server responded with a status of 500 ()

Just recently deployed my first site on AWS with Forge.

Connected to mysql pro and created some data in a table, get request working fine

However when I try to create a new user (vue, axios) I get "Failed to load resource: the server responded with a status of 500 ()"

In my forge .env file, if I change DB_HOST from "127.0.0.1" to the IP of my server, it won't deploy.

How can I configure my env to make a post request?

Cheers