Anyone having trouble creating or updating Dropbox / Assignments?

I'm trying to POST to /d2l/api/le/1.25/{ouid}/dropbox/folders/ or PUT to /d2l/api/le/1.25/{ouid}/dropbox/folders/{folderid} without success.
My nodejs code and the https://apitesttool.desire2learnvalence.com/ both fail with
{
"type": "http://docs.valence.desire2learn.com/res/apiprop.html#invalid-parameters",
"title": "Invalid Parameters",
"status": 400,
"detail": "Request has missing or invalid parameters."
}
There's no data about what parameter is missing or invalid.
Here's my json body for an example PUT request
{
"CategoryId": null,
"Name": "MikesTest Renamed",
"CustomInstructions": {
"Text": "Here are some instructions",
"Html": "<p>Here are some instructions</p>"
},
"Availability": null,
"IsHidden": false,
"GroupTypeId": null,
"DueDate": null,
"DisplayInCalendar": false,
"NotificationEmail": null
}
Any help is greatly appreciated.
Thanks!
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