You could try connecting your Aura to the PC and locating the file \.kobo\affiliate.conf
If you open it in a simple text editor you should see something like
If yours shows a different value for affiliate you could try manually editing it as shown above and saving (make sure you save a copy of the original before editing
After safely disconnecting from the PC, do a full power off and on again and see whether it gives you what you want. If it doesn't, I'd suggest you revert to your saved original.