I have a Trello account, but when colleagues send me a link to join their Boards, I get a message telling me I need to create a trello account to do so - even whilst my logged-in initials are on the same screen as that message! The invite links were sent to the same email address as my account email, so that isn't the problem. Since I already have an account, I can't follow the instructions to create one, and so don't know how to solve this issue. Any ideas?