Javascript function must return false if a new value don't exists in a List

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I’m new to programming and would like to ask for help as to why my program is not working. When I run the checkName(); It just always returns true even if the input username is not in the lists yet or even when it already exists.

Instructions:
I have to create a function that will check if the username given by the user already exists. It must then return a true or a false.

Thank you!

let registeredUsers =  ["Xian","Sam","Gel", "Ian"];

let checkName = function() {
let username = prompt('Please enter username.');
let isExisting = registeredUsers.includes(username, 0);

    if (isExisting = true) {
        return true;
    } else {
        return false;
    }
}

checkName();

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