I'm copy / pasting my api key that I've registered for to do a simple call, and the response I'm getting says it is invalid. Is there an extra step I need to take to get the API key that I have validated?

Here is the endpoint that I'm trying...

https://api.themoviedb.org/3/movie/550?api_key={myapikey}

Response is...

{"status_code":7,"status_message":"Invalid API key: You must be granted a valid key."}