EP logon issue

Hi guys .. hope you are doing well..

When I am trying to access EP .. getting this error.

"You cannot view data on this page because you are not a registered user in Microsoft Dynamics AX. Contact your Microsoft Dynamics AX administrator."

And when I click on "Go back to site"

then getting this error "The log on attempt to the server from user aosophc\axadmin failed, when using Dynamics Adapter LogonAs from process w3wp and thread id 86."

Please guide me to get out of this.

Thanks

Anjaneya