Duo MFA link existing devices

Hi

I have set up DUO in DVLS/RDM according to https://docs.devolutions.net/rdm/data-sources/multi-factor-authentication/duo/

But when I go to set it up per user I only get a message that I need to enroll a device

Currently on the free DUO plan and that might be causing the issue but there is a solution by manually inputting DUO user ID for each user from the DUO admin panel.

This exists in Authentik (a open source identity provider that use the same type of DUO integration) but I cannot find it on DVLS.