LvH Hi, I tried doing so, and indeed I couldn't order an online card - it was telling me "invalid characters" even before requesting the name.
I realized it was taking the name of the Account, which had the "grocery cart" icon in it. So I went ahead and deleted that icon from the account, and I was then successful to make a new online card associated with that account, and I could also go back and change the account icon back to its original.
I am not sure if this was the problem (or similar) you were facing, so hope it helps.
Note: I got an online credit card this time, and it seems there is no way or an option to chose between credit or debit. My previous other online cards, all of them, are debit cards.