ISE admin access, authentication against external radius

Please don't ask me why,
the customer insists and wants to be authenticated on ise (as admin) against an external (microsoft) radius server
is it possible while retaining internal admin users database in a sequence Internal>external_radius or internal>AD ?
thank you in advance for whatever may help

According to Cisco:
External Authentication AND external Authorisation for Admin acces son the ISE can only be done by using LDAP or AD.
For Radius Servers there are a solution for external Authentication and internal Authorisation on the ise:
External Authentication + Internal Authorization
When configuring Cisco ISE to provide administrator authentication using an external RSA SecurID identity store, administrator credential authentication is performed by the RSA identity store. However, authorization (policy application) is still done according to the Cisco ISE internal database. In addition, there are two important factors to remember that are different from External Authentication + External Authorization:
You do not need to specify any particular external administrator groups for the administrator.
You must configure the same username in both the external identity store and the local Cisco ISE database.
To create a new Cisco ISE administrator that authenticates via the external identity store, complete the following steps:
Step 1 Choose Administration > System > Admin Access > Administrators > Local Administrators.
The Administrators window appears, listing all existing locally defined administrators.
Step 2 Follow the guidelines at Creating a New Cisco ISE Administrator to ensure that the administrator username on the external RSA identity store is also present in Cisco ISE. Be sure to click the External option under Password.
Note Remember: you do not need to specify a password for this external administrator user ID, nor are you required to apply any specially configured external administrator group to the associated RBAC policy.
Step 3 Click Save .

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    Last Modified
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    Product
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    Known Affected Releases
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    Description (partial)
    Symptom:
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    Conditions:
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    View Bug Details in Bug Search Tool
    Why Is Login Required?
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    Bug Details Include
    Full Description (including symptoms, conditions and workarounds)
    Status
    Severity
    Known Fixed Releases
    Related Community Discussions
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    **Share your knowledge. It’s a way to achieve immortality.
    --Dalai Lama**
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    •Server Timeout—(Required) Enter the number of seconds that the Cisco Cisco ISE waits for a response from the external RADIUS server. The default is 5 seconds. Valid values are from 5 to 120.
    •Connection Attempts—(Required) Enter the number of times that the Cisco Cisco ISE attempts to connect to the external RADIUS server. The default is 3 attempts. Valid values are from 1 to 9.
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    Hi
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    Kind regards
    John

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    Best regards

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