RADIUS authenticate a Social user

I'm trying to authenticate Azure AD users through the RADIUS provider.

Curently using 2023.8.3 of Authentik. Have Azure AD as a Social login. Have a RADIUS provider up and running (Followed the Generic LDAP setup guide). I can authenticate local users via radtest, but all Azure AD users fail to authenticate.

In the Flows & Stages > Flows > radius-identification-stage > Source Settings >Sources, "Azure AD" and "authentik Built-in" are selected.

**Logs**
The Radius outpost logs for a failed user:
{"code":"Access-Request","error":"flow error non_field_errors: Failed to authenticate.","event":"failed to execute flow","level":"warning","logger":"authentik.outpost.radius","request":"cf3b5515-a98f-41f3-87d1-7397fd620cae","timestamp":"2024-01-16T18:36:03Z","username":"test@....com"}

The radtest response:
radtest test@....com 10
Sent Access-Request Id 70 from 0.0.0.0:49339 to 192....:1812 length 92
User-Name = "test@....com"
User-Password = "..."
NAS-IP-Address = 127.0.1.1
NAS-Port = 10
Message-Authenticator = 0x00
Cleartext-Password = "..."
Received Access-Reject Id 70 from 192....:1812 to 10....:49339 length 20
(0) -: Expected Access-Accept got Access-Reject

**Version and Deployment :**
- authentik version: [2023.8.3]
- Deployment: [docker-compose]

I've also added test@...com (Azure AD user) to the radiussearch group, this also did not work.

Is it possible to authenticate the Social users (Azure AD) through the RADIUS outpost?