Error: "Invalid ID (ident) Provided, ID must be last part of URL" After copy-pasting it from the ID: section on the avatar page

[Malynx]

I'm not sure why the re-uploader is saying this. Everything else works perfectly fine signing in and all that. I'm using the correct API key as that would have outputted a different error message otherwise. I've tried copying it by clicking on the ID and also copying directly from the URL. Any help on this would be greatly appreciated!