In Bizimply we use email addresses are used as unique login credentials. If you are getting this error it means that the address you are entering is already in use within the system. This could be from within your own account or even in another current or previous employers account. The below will show you how to remove the email address to free it up for another profile or to be added as an admin.
If the email address is firstname.lastname@example.org, what you can do is use the email address email@example.com and all emails will still go to the original firstname.lastname@example.org address. Most email providers (incl. Gmail, Hotmail, Outlook) ignore the '+' and anything trailing it before the '@' symbol.
If the email address is still not working for you, please get in touch with us and we will look into it further.