Elasticsearch-php auth error

I've been using the php client successfully with a remote server, and I've
set up a new server and run into auth problems using the PHP client

$clientParams['connectionParams']['auth'] = array(

My issue is now I get back a 401 Authentication Required every time I try
to hit the endpoints using the PHP client but I've gone on the chrome
extension Postman to try sending some basic auth requests using the user/pw
and the server responds correctly. Any ideas what might cause this or how
to go about debugging?

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