Issue Creating InTune Compliance Notification

Hi, complete Graph newbie here trying to learn the ropes. Currently using the Graph explorer to get comfortable. We're an MSP, so we set up a lot of InTune tenants for customers and currently do it manually, I'd like to automate a lot of it which I've done with regular old PowerShell, but some of it seems to be restricted to the (better) Graph.

Currently, I'm using https://learn.microsoft.com/en-us/graph/api/intune-notification-notificationmessagetemplate-create?view=graph-rest-1.0&tabs=http

and

https://learn.microsoft.com/en-us/graph/api/intune-notification-localizednotificationmessage-create?view=graph-rest-1.0&tabs=http

To try and create a POST request to: https://graph.microsoft.com/v1.0/deviceManagement/notificationMessageTemplates

This is what I have:

{
    "@odata.type": "#microsoft.graph.notificationMessageTemplate",
    "displayName": "Your Template Name",
    "defaultLocale": "en-us",
    "brandingOptions": "includeCompanyLogo",
    "localizedNotificationMessages": [
        {
            "@odata.type": "#microsoft.graph.localizedNotificationMessage",
            "locale": "en-us",
            "subject": "Your Notification Subject",
            "messageTemplate": "Your Notification Message",
            "isDefault": true
        }
    ]
}

In the request body using Graph explorer. A lot of values are place holders but they should still create just to test. Initially I was getting errors with the payload but have fixed those.

Now, no matter how much modifying I do, I always get this as 400 bad request error:

{
    "error": {
        "code": "BadRequest",
        "message": "{  \"_version\": 3,  \"Message\": \"An error has occurred - Operation ID (for customer support): 00000000-0000-0000-0000-000000000000 - Activity ID: 2e3410e5-8f41-8b2f-755c-f42d2944e26d - Url: https://fef.msub07.manage.microsoft.com/StatelessNotificationFEService/deviceManagement/notificationMessageTemplates?api-version=5018-07-01\",  \"CustomApiErrorPhrase\": \"\",  \"RetryAfter\": null,  \"ErrorSourceService\": \"\",  \"HttpHeaders\": \"{}\"}",
        "innerError": {
            "date": "2023-11-10T14:24:35",
            "request-id": "efbf0aae-23bf-445f-83e8-141c3d0e7255",
            "client-request-id": "2e3410e5-8f41-8b2f-755c-f42d2944e26d"
        }
    }
}

Could anyone help me identify what's wrong, or point me where I can learn more?

Thank you so much.