ADFS: Allowing ActiveSync clients to use App Passwords

Modern Authentication is enabled at the tenant.
Enabled one user with MFA within Office 365
Without any additional Claim Rules MFA seemed to work for ADAL client (Outlook 2016)

Created App password and attempted to use it for legacy ActiveSync client.
Authentication does not succeed (instead user is prompted to fill in fields like server etc..)

Any ideas?

Thank you.
K BAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Vasil Michev (MVP)Commented:
App passwords do not work against AD FS, so make sure that the client doesnt try to "talk" to the AD FS server. If it hits the AD FS server, the request will fail. If it follows the legacy path, authentication is done directly via the service and you should see no trace of it on AD FS side. In this scenario app passwords will work, as long as you are OK with them bypassing all restrictions you have in place with AD FS.

This is discussed for example here:

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.