Named callout Null in http request with named credential - What would cause it?

Question

I am making a callout and getting the error

"System.CalloutException: The callout couldn't access the endpoint. You might not have the required permissions, or the named credential "XXX" might not exist."

When I inspect the log, it appears that the Named callout has all values as null. I don't understand why since we already set up the named credential in Salesforce.

I am attaching both the named credential and the error log.

  HttpRequest reqData = new HttpRequest();
    Http http = new Http();
    
    String subscriptionApi = 'callout:xxx/https://xxx.com/api/v2/customers/' + custId + '/subscription_for_items' + params;
    System.debug('Complete request ' + subscriptionApi);
    String method = 'POST';
    reqData.setHeader('Authorization', 'Username xxxxx');
    reqData.setHeader('Content-Type', 'application/x-www-form-urlencoded');
    reqData.setHeader('Connection','keep-alive');
    reqData.setTimeout(25000);
    reqData.setEndpoint(subscriptionApi);        
    reqData.setMethod(method);

    
    HTTPResponse response = http.send(reqData);
    System.debug('response ' + response);
    return response;

Any ideas? Thanks

EDIT: After incorporating Keith's suggestion the values are now not null. I am now getting this