Signin-up have phase has sveral limitations.
1. All mandatory fields have to be filled in.
2. You cannot sign-up using an existing email acount - In case you sign-up using email acount exist in the system, the next error message will be shown:
In case you still want to sign-up using that email acount, you can add "+1" after the name of the mailbox. In example: in case "email@example.com" exists, fill in "firstname.lastname@example.org".
* you can use any number - +1,+2,+3,...
3. You cannot sign-up using existingcompany registration number.