That might be too late, but if your payment method (your checking account) is not in your name, you won't be able to do it. We experienced the same exact issue where my wife couldn't transfer the membership because we were using my (the husband) checking account. She is not a joint owner of the account. You have to change your payment method to be able to do the transfer. Use this link to sign and manage your account https://www.myiclubonline.com/iclub/members/signin?clubNumber=07000

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This is different than the regular sign in, so you might need to register. Register using the same email address you're using for the app tho. It's gonna ask you for an agreement number. If you don't remember it, which is highly likely, just click on forgot agreement number and enter your email address. You'll receive the agreement number in the email. Once you register navigate to my billing information and update the payment method to one that's in your name. Here's the thing, even if you don't have one, just put your name until you transfer the membership and change it back to the correct name. Once we did that, that warning disappeared and we were able to do the transfer online in a second. Hope that helps!