Hi @hangam2,
Unfortunately, as stated here, passwordless connections, flows started using device authorization, and the SAML and WS-federation protocols are not supported by the Account Link Extension.
If you’d like to advocate for such support you can go to our feedback category here and vote for this feature:
In the meantime, if you still want to link accounts that are not supported by the Account Link Extension, you will have to create a custom solution using Actions and the Management API.
If you have any questions on implementing it feel free to let us know.
Have a good one,
Vlad