I just started at a new company and I've been invited to access their Apple Developer Program. When I click the invite in the link I'm directed to a "Create Your Apple Account" page where I'm prompted to provide my email address. When I put my work email I receive an error saying that my Apple Account cannot end in the domain and to choose a different email address. When I try to use my personal Gmail, it says my email address is not available and to choose a different address. Even my iCloud email isn't allowed. I'm not sure what else to do to gain access.