as you have mentioned, you have pre-auth check = App Authentication on your weblogin page.
you have mentioned that your guest users authenticate fine.
This means that you have a service of type = Aruba Application Authentication, this service does the pre-auth check
so in this service do you have AD auth source as well?
Pre-auth CPPM service should look something line this

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Original Message:
Sent: Dec 02, 2022 10:17 AM
From: Bruno Costa
Subject: Clearpass captive Portal With AD authentication
Hi,
I am already using guest service with mac caching with local user database.
You are saying that I need to create another service for radius request??
When I test a client machine to connect I get welcome by the captive portal with an initial guest role, when I input the credentials it loads and then it send back to the captive portal with an "Authentication Failed" message.
Original Message:
Sent: Dec 02, 2022 09:49 AM
From: Tuna AKYOL
Subject: Clearpass captive Portal With AD authentication
pre-auth check can be RADIUS or App Authentication. It can be edited in guest page editor. Imo you should use "RADIUS -- check using a RADIUS request". And you need to create a Radius service on policy manager which include Auth source as your AD to handle your RADIUS request. Or you can use App Authentication in the same way as RADIUS.
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Tuna AKYOL // ACMX#1374 // AASX
Original Message:
Sent: Dec 02, 2022 09:18 AM
From: Bruno Costa
Subject: Clearpass captive Portal With AD authentication
Hi
I do not touch pre-auth cheching , but yes its enable.
I need to create that authetication app where?
Regards
Original Message:
Sent: Dec 02, 2022 07:35 AM
From: Tuna AKYOL
Subject: Clearpass captive Portal With AD authentication
Hi,
Did you enable 'pre-auth check' on Guest Page? With that option ClearPass check credentials against AD. But you have to create an 'Application Authentication' service to serve this request.
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Tuna AKYOL // ACMX#1374 // AASX
Original Message:
Sent: Dec 01, 2022 09:34 AM
From: Bruno Costa
Subject: Clearpass captive Portal With AD authentication
6.9.10
I do not see any entries regarding the guest service with AD. Seems that the requests are not coming to clearpass correct. I only get the IP address correct and the our guest portal. AS I put some AD credential it comes back again to the same login portal saying invalid user /password
Original Message:
Sent: Nov 30, 2022 08:51 PM
From: Ariya Parsamanesh
Subject: Clearpass captive Portal With AD authentication
what clearpass version are you running?
also check the event viewer for any entries
------------------------------
If my post was useful accept solution and/or give kudos.
Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
Original Message:
Sent: Nov 30, 2022 08:05 PM
From: Bruno Costa
Subject: Clearpass captive Portal With AD authentication
@ariyapIn the access tracker we do not see any request logged
Original Message:
Sent: Nov 30, 2022
From: ariyap
Subject: RE: Clearpass captive Portal With AD authentication
so i take it you have guest repository and AD as auth sources right?
please share the screenshot for access tracker as well
------------------------------
If my post was useful accept solution and/or give kudos.
Any opinions expressed here are solely my own and not necessarily that of HPE or Aruba.
Original Message:
Sent: Nov 30, 2022 06:31 PM
From: Bruno Costa
Subject: Clearpass captive Portal With AD authentication
Hi all
we are having an issue with the captive portal, while using AD as authentication source
if We use the guest repository our portal is working ok.
Ir we use AD repository we get a login error, like invalid username or password.
What could be the issue?
regards