When the user logs in, the user is directed to AAD to log in, where they enter their credentials. They're then redirected to another screen prompting them to log in with the AAD credentials.
How can this prompt to log in with AAD credentials be avoided? This is the only way that users will be able to authenticate in the app.
Thanks for your response. However, I don't think that it answers the original question. These resources answer the question of how to access secured resources anonymously. The original question was:
Why does the user get a login prompt to log in to ArcGIS Enterprise when they've already entered their AAD credentials and ArcGIS Enterprise is configured to use AAD as the identity provider?