@itsmeKY said:
Invalid API key: You must be granted a valid key.
when trying to test my api, to see if it works using this url:

https://api.themoviedb.org/3/movie/550?api_key=xxxxx

i get the following error.
previously only my access token worked, now that does not work too.
This has halted my progress, can anyone help?

Are you testing in a new tab or window on your browser?
Or are you using Try It! of documentation?

Thanks, the problem has already be solved by another member :)