I felt it wasn’t the mixdown, but just wanted to be sure.
Initially couldn’t consolidate it, it was just coming up with this error message;

But then I realised I wasn’t saving it to the drive with the AvidMediaFiles folder, then it appeared to have worked.
Unfortunately, regardless of whether I consolidate the AAF or link to the media, or whichever hard drive I try get it to save to. It still comes up with the same message.
These are the settings I’m using when consolidating, in case if anything is wrong there. (I’m not sure why it’s talking about video when there’s no video in the sequence?)

The project isn’t in my documents folder, is that potentially an issue?
Feel free to ask for more screenshots if things aren’t clear.