@richard_isai said:

Im getting this error

<NSHTTPURLResponse: 0x111459ac0> { URL: https://api.themoviedb.org/3/authentication } { Status Code: 401, Headers {
    "Alt-Svc" =     (
        "h3=\":443\"; ma=86400"
    );
    "Cache-Control" =     (
        "public, max-age=300"
    );
    "Content-Type" =     (
        "application/json; charset=utf-8"
    );
    Date =     (
        "Fri, 21 Jul 2023 01:00:31 GMT"
    );
    Server =     (
        openresty
    );
    Vary =     (
        Origin
    );
    Via =     (
        "1.1 df49d0a48eba3cccd76163f6490dc2ce.cloudfront.net (CloudFront)"
    );
    "x-amz-cf-id" =     (
        "Ktf4uX5s1YWrK6369dMHKaUBD_3ObhooXAbtvWj-cGm4grcIbAa1gg=="
    );
    "x-amz-cf-pop" =     (
        "QRO51-P3"
    );
    "x-cache" =     (
        "Error from cloudfront"
    );
} }

Can you tell us which of these errors is occurring?

See the list of TMDb server error warnings here.
https://www.themoviedb.org/documentation/api/status-codes
In your case:

Code    HTTP    Message  
3       401     Authentication failed: You do not have permissions to access the service.
7       401     Invalid API key: You must be granted a valid key.
10      401     Suspended API key: Access to your account has been suspended, contact TMDb.
14      401     Authentication failed.
16      401     Device denied.
17      401     Session denied.
30      401     Invalid username and/or password: You did not provide a valid login.
31      401     Account disabled: Your account is no longer active. Contact TMDb if this is an error.
32      401     Email not verified: Your email address has not been verified.
33      401     Invalid request token: The request token is either expired or invalid.
34      401     The resource you requested could not be found.
35      401     Invalid token.
36      401     This token hasn't been granted write permission by the user.
38      401     You don't have permission to edit this resource.
39      401     This resource is private.  

This one: 7 401 Invalid API key: You must be granted a valid key.

Im using the same key as always

@richard_isai said:
This one:
7 401 Invalid API key: You must be granted a valid key.
Im using the same key as always

I don't really know how the TOKEN process works.
But I think you need to send the "Access Token Auth" and not the "API Key Auth".
Look here:
https://developer.themoviedb.org/reference/intro/authentication
But it's better to wait for someone who knows the process.

In using the same Access Token Auth as always

Hi @richard_isai, this response from the server would indicate that you are sending the wrong api key or token or not sending one at all.

You would need to send the api key as: https://api.themoviedb.org/3/authentication?api_key=xxxxxxxxxx

or, send the token in the header as "Authorization: Bearer xxxxxxxxxxxxxxxxx".

From the authentication doc, the key and token are two distinct and separate things and you must use the key in the url and the token in the authorization header.