The URL to set a password on your new account does not show up in the e-mail sent to new users.
The reason for this is that it is wrapped in the characters <>. The same problem happened in the password reset e-mail, but that was fixed with this solution: https://wordpress.stackexchange.com/questions/246377/missing-url-in-password-reset-email
I can't find a similar filter for the new user password set e-mail. Does anyone know how that can be done?