User you want to add to a team already exists

You want to add a user to your team , but get the error message that this account already exists? This is the solution:

You cannot add a team member who has already created another SeaTable account with the same e-mail address. In order to create an account with this email address, this user must back up all their data (e.g. export and delete their previous account. You can find out more about this in the article Can two SeaTable accounts be merged?