/.auth/login/aad/callback fails with 401 after sucessfull login

[MrHinsh]

RAISED ON: Azure/static-web-apps#1571
ALSO: https://learn.microsoft.com/en-us/answers/questions/2114272/auth-login-aad-callback-fails-with-401-after-suces?comment=question

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I have auth setup and I understand that /.auth/* is supposed to handle both the outbound and the inbound callback. However I get a 401 on return for https://prototype.nkdagility.com/.auth/login/aad/callback

To Reproduce

Steps to reproduce the behaviour:

1. Go to https://prototype.nkdagility.com/.auth/login/aad/
2. Login
3. Return to https://prototype.nkdagility.com/.auth/login/aad/callback
4. 401

URLs

Site: https://prototype.nkdagility.com
Build: https://github.com/nkdAgility/NKDAgility.com/blob/main/.github/workflows/main.yaml
staticwebapp.config.json: https://github.com/nkdAgility/NKDAgility.com/blob/main/staticwebapp.config.json
GitRepo: https://github.com/nkdAgility/NKDAgility.com/

Expected behavior

I expected this to be handled and return to site with auth tokens present.

Any help would be appreciated.