It appears that is a bug in the 'Delete Collection' endpoint:
DELETE /api/collections/x-mitre-collection--1f5f1533-f617-4ca8-9ab4-6a02367fa019/modified/2025-10-28T14:00:00.188Z?deleteAllContents=true
Requests will fail, return a 500, and log the following message:
message: 'Delete collection failed. Error: Badly formatted parameter',
It appears that is a bug in the 'Delete Collection' endpoint:
Requests will fail, return a 500, and log the following message: