Xibo API not working

Good day,

I tried following the Xibo API example using Postman but was unsuccessful at requesting the access_token. When I run the program, the below error is returned:

{
    "error": {
        "message": "Page not found",
        "code": 404,
        "data": []
    }
}

I tried going to //mycmsurl/api but receive an error that no page was found. Going to my Xibo CMS itself I can see the path for web/api/index.php. Not sure if this matters but I have SAML authentication enabled. Any assistance greatly appreciated. Thanks.

Which CMS version are you using please?

Could you show me a screenshot of the call in Postman?
I assume you did configure the environment in Postman so it knows your CMS address etc?