Issue with Twitter API possibly Tweetinvi (Forbidden)

Question

I've been trying for days on this and think that the issue is somewhere with my developer account but thought I'd ask for advice here first before digging in there. I have followed the documentation and multiple tutorials and this should work it seems but no matter what call I make using Tweetinvi to Twitter I get "Forbidden" which when looking at the twitter codes means my authorization is correct but that I am asking for something that I don't have access to, but I am just trying to send a test tweet to see if the program works, which according to Twitter's documentation I should have full access to. Here's the code that I took from Tweetinvi's Tutorial on how to make a "Hello World" tweet but it just doesn't work cuz it returns "Forbidden".

static async Task Main(string[] args)
    {
        var userClient = new TwitterClient("APIKey", "sAPIKey", "AccessToken", "sAccessToken");
        var tweet = await userClient.Tweets.PublishTweetAsync("This is a test tweet");
        Console.WriteLine(tweet);                
    }

It's not just the send tweet function either, if I try to pull any information at all it says it's forbidden so I feel the issue is on Twitter side not my code but I am just trying to learn it as a hobby and have no idea. Just was told Tweetinvi would make everything take 5 minutes and now I am at three days of trying to figure this out. Any help in figuring this out would be nice and greatly appreciated.

Answer 1

Twitter's latest API release [Nov 15th 2021] has an entry level of access called "Essential" that provides access to the v2 API, because this should be the base for most new apps. If you need access to v2 and also to the legacy v1.1 APIs in the same app, you will need "Elevated" access, which is also available for free. The PublishTweetAsync method you are calling in the code in this question is trying to hit the v1.1 Tweet statuses/update endpoint, so your app will need Elevated access in order to make it work.