API Key not working with OpenCloud V2 MessagingService

Hey all, I am trying to use the V2 OpenCloud MessagingService to publish a message to my game, and I keep getting met with the following error:

{"code":7,"message":"User cannot manage universe.","details":[]}

Absolutely no information. The API key has required scopes, see API key introspect here:

{
    "name": "[API] pathOS",
    "authorizedUserId": 814914682,
    "scopes": [
        {
            "name": "group",
            "operations": [
                "read",
                "write"
            ]
        },
        {
            "name": "universe-datastores.control",
            "operations": [
                "create",
                "delete",
                "list",
                "snapshot"
            ],
            "universeIds": [
                "1484369645"
            ]
        },
        {
            "name": "universe-datastores.objects",
            "operations": [
                "create",
                "delete",
                "list",
                "read",
                "update"
            ],
            "universeDatastores": [
                {
                    "universeId": "1484369645"
                }
            ]
        },
        {
            "name": "universe-datastores.versions",
            "operations": [
                "list",
                "read"
            ],
            "universeDatastores": [
                {
                    "universeId": "1484369645"
                }
            ]
        },
        {
            "name": "universe-messaging-service",
            "operations": [
                "publish"
            ],
            "universeIds": [
                "1484369645"
            ]
        },
        {
            "name": "universe.place.instance",
            "operations": [
                "read",
                "write"
            ],
            "universeIds": [
                "1484369645"
            ]
        },
        {
            "name": "universe.user-restriction",
            "operations": [
                "read",
                "write"
            ],
            "universeIds": [
                "1484369645",
                "3439502373",
                "9782809904"
            ]
        }
    ],
    "enabled": true,
    "expired": false
}

To clarify, I am trying to use the POST https://apis.roblox.com/cloud/v2/universes/{universe_id}:publishMessage API endpoint.

Not sure if providing my body is needed considering this is using a Group API key.

I will add, due to recent group drama, the game is currently shut down. That is my only guess as to what could be causing this.