Bug: Microsoft EAM Sign-Ins Fail with PUSH and Symbol2Accept Methods – SecureAuth Support

Version Affected: 22.12 and later
Bug Number: Not provided in source
Bug Status: Closed - Fixed
Fixed in Version(s): 24.04 RU3+

Overview

When SecureAuth Identity Platform is configured as a Microsoft Entra External Authentication Method (EAM), sign-ins using the Push or Symbol2Accept MFA methods fail with the following error from Entra ID:

AADSTS5001256: Failed to complete authentication with external provider due to invalid id_token. Failure details: missing required 'acr' claim.

Cause

Debug logs show one of the following messages:

Message="[TokenService].[AttachAmrAcr] Current registration Method is.PUSHACCEPT"

Message="[TokenService].[AttachAmrAcr] Current registration Method is.SYMBOL2ACCEPT"
Message="[TokenService].[AttachAmrAcr] Registration method: pushaccept doesn't map to a supported amr value password, sms, call, email, help_desk, push, push_accept, push_accept_symbol, push_accept_biometric, oath, yubikey, sms_link, email_link,

The registration methods PUSHACCEPT and SYMBOL2ACCEPT did not map to a supported Authentication Methods Reference (AMR) value — specifically not to push_accept or push_accept_symbol — so these methods never got populated in the token's AMR claim, and Entra ID rejected the token for missing the required acr claim.

Resolution / Workaround

Upgrade to 24.04 RU3 or later. This release adds swk (software key) as a supported AMR value and maps both PUSHACCEPT and SYMBOL2ACCEPT to it, so the token's AMR claim is populated correctly and Entra ID accepts it.

Sample token when the PUSHACCEPT or SYMBOL2ACCEPT method is used: Id_token

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