An E-Vite account can have multiple distributors or vendors registered but you must be invited to them individually. Contact that company's E-Vite administrator for help.
E-Vite accounts often have more than one company registered with them, which appear on the Select Company screen. However, you must be invited to each company for it to appear on this screen.
If your company is missing, contact the E-Vite administrator for that company to get an invitation. For detailed instructions on registering a company, see Getting Started with E-Vite.