I was a Fictionwise customer that transferred to Nook UK. That transfer went okay and all 175 books transferred over. Then Nook transferred to Sainsburys. From that point on I dropped through the cracks, probably because the genre I read, MM Romance, was not sold by Sainsburys.
Sainsburys manually opened an account for me as the Nook Transfer didn't seem to go through but no books transfered from Nook to Sainsburys. Sainsburys gave me a £5 Credit which turned out to be invalid. Now, again I assume as Sainsburys won't reply to me, I am ignored for the transfer to Kobo, I can only guess because I have no books with them. But I do have an account.
I can't say i'm surprised, a bit miffed tbh, to all intents and purposes I lost the account with my books once Nook closed. I didn't as they are in Calibre, but I have never received a penny from anyone for the hassle.
A real life lesson on why its imperative to back up books outside of whatever company holds the account. For an account to be transferred 3 times and the customer to end up with nothing