Cannot enable tfa on Proxmox VE

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Check all nodes in cluster are having same version, by following command

pveversion -v

If not, need to process update, by shell or WebUI.

If this is still not working, execute below command on all nodes, and then try again.

systemctl restart pvestatd

Refer – https://forum.proxmox.com/threads/delete-user-failed-cannot-update-tfa-config-following-nodes-are-not-up-to-date.104970/