Issue
I created my first organization and invited a user to it. They receive the email invitation and appear as a member of the organisation and project. However, they when they click join in the email invitation they are denied access.
The organisation is not connected to Azure Active Directory as suggested in this thread.
We have also tried troubleshooting connectivity as outlined by Microsoft docs.
Solution
You can try to create a new incognito window and sign in to your organization : https://dev.azure.com/{organizationName} with the invited account in this incognito window.
This is because when the user clicked the email invitation, this will automatically jump to the browser to use the default account cached by the browser to log in to the organization, and this default account could not be the invited account.
Answered By – Hugh Lin
This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0