I have seen that occasionally over the years. Usually removing the book and downloading it again will fix things. I think with one I had to delete the book from the account and the restore it from the archive to get it working. One thing I usually do when this sort of thing happens is to restart the device between attempts.
Something that should fix it but can take time is the "Repair your Kobo account" function. This is on the "Device information" page of the settings. When you use this, it removes and downloads all your purchased books from the Kobo server. How long it takes will depend on how many books you have. This doesn't affect any sideloaded books you have on the device.
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