$streamheaders[] = 'Client-Id: <client-id-here>, Authorization: OAuth <oauth-here>';
is wrong
$streamheaders[] = 'Client-Id: <client-id-here>';
$streamheaders[] = 'Authorization: Bearer <oauth-here>';
is correct
$streamheaders[] = 'Client-Id: <client-id-here>, Authorization: OAuth <oauth-here>';
is wrong
$streamheaders[] = 'Client-Id: <client-id-here>';
$streamheaders[] = 'Authorization: Bearer <oauth-here>';
is correct