I don't see an option to invite to Apple developer accountLast Updated: October 25, 2018
Apple only allows to invite people to their Apple developer team if you are enrolled as an 'organization' account. If you don't see a 'People' section in your developer.apple.com dashboard that mean you are enrolled in as an 'individual' account.
In this case you won't be able to add us an agent to your account. The only solution is to provide us with the username and password for your Apple account. In order to do so please reach out to us at firstname.lastname@example.org and we will assist you in submitting your app to Apple.