Regarding the Microsoft Graph backends (OneDrive v2 and others), the official duplicati/duplicati Docker image still seems to be having trouble finding these, and in fact it sometimes can’t even find the old API from same .dll.
Official docker image is not including all backends #3198 includes a detailed summary of my investigation effort, which I doubt will come to a definite conclusion (lack of Docker debugger, plus lack of dynamic loader expertise).
OnedriveV2 not available as provider choice got a non-technical request for feedback on exactly what’s missing.