Basic JavaScript - Concatenating Strings with the Plus Equals Operator

I cant figure out what im missing to make this code work?

let myStr = "this is the first sentence. ";

mystr += “this is the second sentence.”;

let myStr = "this is the first sentence. ";
mystr += "this is the second sentence.";

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Concatenating Strings with the Plus Equals Operator

Link to the challenge:

Your variable names are not the same. Also your text needs to be exactly the same as required by the challenge. Case is important in both cases.