@borgesenioc said:
I tried to use that API and got a 401 error. Then I generated a second API and keep getting that error. Can you help me?
The first API that was approved for me had the 401 error. I created a new one, but still get the same error, apparently an authorization request.

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31      401     Account disabled: Your account is no longer active.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.  

@ticao2 said:

@borgesenioc said:
I tried to use that API and got a 401 error. Then I generated a second API and keep getting that error. Can you help me?
The first API that was approved for me had the 401 error. I created a new one, but still get the same error, apparently an authorization request.

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31        401     Account disabled: Your account is no longer active.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.  

I'm having the same issue.First i was given an API key upon creating an account and then it started showing error after few days.Then i created another one and it still doesn't work. The error im getting is Code:3 , HTTP:401 , Message:Invalid API key: You must be granted a valid key.

I'm also getting Code 3, Authentication failed.

Can you give us the exact query you have sent to our API ?