Receiving 401 Unauthorized Message on Rest API Call that does not require permissions

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I’ve set up a custom GET API end point for site B.

function register_custom_rest_endpoint() {
    register_rest_route( ‘coupon/v1’, ‘/create’, array(
      ‘methods’ => ‘GET’,
      ‘callback’ => ‘create_coupon_callback’,
      ‘permission_callback’ => ‘__return_true’,
    ) );
  }
add_action( ‘rest_api_init’, ‘register_custom_rest_endpoint’ );

https://mydomain.com/wp-json/coupon/v1/create?sp_number=9576&retailer_name=abcdefgh

If I visit the URL in my browser, my GET request works and is returning a response as expected.

However when I call it from my other website, I get a 401 unauthorized error.

Here is my code for the API request from Site A:

$endpoint_url = ‘https://mydomain.com/wp-json/coupon/v1/create?sp_number=’ . rgar( $entry, ‘1’ ) . ‘&retailer_name=’ . rgar($entry,2);
$response = wp_remote_get( $endpoint_url );

Error message: 401 Authorization Required

I was under the impression that the permission\_callback being set to return true would mean I would not need authorization for the API call, yet when calling from Site A I’m getting the authorization required message.

Any guesses?

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