Exchange linked mailboxes not authenticating with ESP and Alternative SSO enabled

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https://support.kemptechnologies.com/hc/en-us/articles/209763253--Alternative-SSO-Domain-Field-Visibility-Selection 

when setting this up to pass authentication to a trusted SSO domain authentication does not work.
the ldap server for the trusted domain is set to the main domain controllers.

however any authentication requests are failing immediately i could not find any detail in the documentation about this.

if bypassing the loadbalancer, logging directly into the server results in a successful login.

 

the closest case of a similar issue was in this post:

https://support.kemptechnologies.com/hc/en-us/community/posts/210733266-issue-with-users-that-has-a-linked-mailbox-when-accessing-the-site 

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