Status 409 when uploading an automated backup to OneDrive

[IngmarStein]

The problem

Uploading an automated backup to OneDrive fails for me with the following error message:

Error during backup in async_upload_backup: Status 409, message The server returned an unexpected status code and no error class is registered for this code 409

What version of Home Assistant Core has the issue?

core-2025.2.0b5

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

onedrive

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

No response