The BtB display is based on whether there are some entries in the database on the device. These are downloaded from the Kobo server when the book is downloaded. If the book was downloaded to the Aura before you changed the affiliate, it probably didn't download the BtB info. You could try removing the book from the Aura and downloading then downloading it again. This worked when I was experimenting with the BtB info last week and wanted to refresh the data for the book I was using. Do a sync first so you don't lose the reading position or any annotations.
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