[ERROR] Response status code does not indicate success: 400 (Bad Request).

[CallumJThompson]

Causation: Opening DMM or clicking the 'Update' button to start checking for updates results in the error, preventing any mods from being able to update.

Tried:

• Updating with and without WireGuard (as I thought it might be due to using a different DNS. Failed.)
• Most mods did not have metadata fetched. Updating still fails after fetching metadata for all applicable mods.

As far as I know, there is no way to find further information on the error itself. I cannot find logs, although this may be due to me not looking in the right places.

Here is an image showing the error, for what it is worth: