In the current Seamless Access implementation, we use a Seamless Access cookie to allow for the "Access button" to be pre-populated with the latest chosen institute. This allows for cross-domain ease of use.

It was marked that FedCM would beyond its authentication case, provide a potential solution for this. Is it possible to pre-populate with a identity provider from the FedCM list (and potentially match against accepted identity providers) - when there has not yet been an association to a identity.

This would be similar to pre-populating the Google sign-in button on a site, with the name of a FedCM already used profile.