SAML Multiple external AD sources ?

Is it possible to use multiple AD sources for SAML authentication ?

When in the ADMIN/SAML console, I can happily add multiple identity providers (each with it's own unique group). However when i try to login, if i provide credentials for a user that is Appian then no problems, but if I provide user credentials for the external user, then I instanly get username / password failed message.

 

If I add a row to the identity provider section for my external sources then those work ....

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