This past year many DNA and Genealogy websites have stepped up their security since 23andMe had a breach. Many have added a 2-step verification using your email address and password to access your account. This is a good thing but if you have someone else that is helping you with your research it makes it impossible for them to access your account. MyHeritage.com has heard the complaints about this problem and have come up with a solution. Please see the link below to learn about their process so that you can still share your account with those who are helping you in your research.
New: Sharing DNA Results with a Collaborator – MyHeritage Blog