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NetScaler Issue with NPS Azure MFA Extension

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I'm having a problem with NetScaler and NPS with Azure MFA extension. 
Some users are receiving an authentication error: invalid credentials. 

When I checked the AAA debug log, I found an error with MS-CHAP error ERROR_AUTHENTICATION_FAILURE (691). Additionally, I found the following message on the NPS server: 'NPS Extension for Azure MFA: NPS Extension for Azure MFA only performs Secondary Auth for Radius requests in AccessAccept state. Request received for User XXX with response state AccessReject, ignoring request.'

I found this post, https://www.meinekleinefarm.net/citrix-netscaler-gateway-nps-extension-for-azure-mfa-fails-after-introducing-the-microsoft-domain-controller-security-baseline/.

It seems to solve my problem. However, the suggested solution using the 'Enable NTLMv2 Compatibility' RegKey did not work.


Any other ideas? 

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