'404 - Invalid Username' when requesting /currently-playing endpoint

[anomis66]

Plan: Free

Country: United Kingdom

Device: Surface Pro 3 

Operating System: Windows 10 (21H2) using Brave browser

My Question or Issue:

I believe I have successfully authenticated to the API using this code:

/* Get Spotify Authorization Token */
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,            	'https://accounts.spotify.com/api/token' );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 	1 );
curl_setopt($ch, CURLOPT_POST,           	1 );
curl_setopt($ch, CURLOPT_POSTFIELDS,     	'grant_type=client_credentials' );

$headers = array();
$headers[] = 'Authorization: Basic '.base64_encode($client_id.':'.$client_secret);

curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

if ( !CURL_EXEC( $ch ) ){
	exit( 'Error: ' . CURL_ERROR( $ch ) . ' - Code: ' .CURL_ERRNO( $ch ));
} 

$auth_response_json = CURL_EXEC( $ch );

CURL_CLOSE( $ch );

$auth_response = json_decode( $auth_response_json, true );

if ($auth_response['access_token'] != ""){

	print_r($auth_response);
	echo('<hr>');

	echo "<script>console.log('Authentication successful!' );</script>";
	$auth=1;
	$access_token = $auth_response['access_token'];
	
}
else {
	echo "<script>console.log('Authentication failed!' );</script>";
	$auth=0;
}

I am receiving an [access_token] in my response that looks like this: 

Array ( [access_token] => BQAy-1lTVzXAQxvkq_LLchAjOJbPrBTAyHMUsbfYutP0xDopzy4_lyJzSK6tUn74qlGGez2jAcswga6UckOaEiTkyBrj1hGu-jL2Ce11aGZ1ITYjSRI [token_type] => Bearer [expires_in] => 3600 )

When I try to use the given [access_token] to request the /currently-playing track, I get a 404 error.

{ "error" : { "status" : 404, "message" : "Invalid username" } }

The code I am using to call the /currently-playing track is this:

if($auth=1){

	$ch = curl_init();

	curl_setopt($ch, CURLOPT_URL, 'https://api.spotify.com/v1/me/player/currently-playing' );
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');

	$headers = array();
	$headers[] = 'Authorization: Bearer '.$access_token;
	$headers[] = 'Content-Type: application/json';
	curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

	$result = curl_exec($ch);
	if (curl_errno($ch)) {
		echo 'Error:' . curl_error($ch);
	}
	curl_close($ch);

	print_r($result);

}
else {

	echo "<script>console.log('Not Authenticated, so cannot get current track.' );</script>";
	echo("Ln: ". __LINE__);

}

I have also tried to call the /me/player status, with the same 404 result.

The Web API documentation makes no mention of a 404 status for the Get Currently Playing Track endpoint, and I can see no reference to a username parameter.

[anomis66]

Based on other posts in the community, am I to presume that the /v1/me/player/currently-playing is still fubar.