Below errors seen in the smaccess logs, while executing WebAuthn request flow and unable to complete the device registration..
\[c85d87d4-3d08f2e2-863c145b-dd0934f8-da6dbc13-00] [58] Received WebAuthn Error from agent : NotAllowedError - WebAuthn is not supported on sites with TLS certificate errors. [] [] []
R12.8 SP9
It was identified that self signed certificates were used on the Access Gateway server to call the WebAuthn requests
CA Signed server certificate with CA certificate chain for enabling the Access Gateway over SSL resolved the issue for executing the WebAuthn device registration flow.
Alos ensure you have enabled below Access Gateway's ACO Parameters.
-> Enable UseSecureCookie.
-> Added .ico in the IgnoreExt