I was experiencing the same issue as everyone else and have a resolution to the issue. There is a known documented issue between vSphere v7 (possibly other versions), and the DUO MFA Adapter 2.X vers...
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I was experiencing the same issue as everyone else and have a resolution to the issue. There is a known documented issue between vSphere v7 (possibly other versions), and the DUO MFA Adapter 2.X version. Due Authentication for Microsoft AD FS v2.0.0 does not support ODIC. I followed the vMware guides, and the instructional set from https://blogs.vmware.com/customer-experience-and-success/2022/06/tam-lab-enabling-mfa-in-vsphere-7.html and ended up with a general error splash page and event ID 346 on my ADFS server. You have to downgrade/uninstall the DUO MFA Adapter 2.0 on your ADFS, and install the previous version 1.2.0.17. It's not easy to find the download, so here it is for easy reference: https://dl.duosecurity.com/duo-adfs3-1.2.0.17.msi After installing this version, everything started working as expected. Hopefully this helps someone. -T
