This is why I don’t like passkeys. I’m surprised the “use site from multiple devices” use case isn’t more common.

Am I nuts for accessing a site from both my mobile phone as well as from the multiple computers I use?

This also gets super messy when combined with multi-site auth services like id.me where I need to use the same login to access very diverse sites and services from multiple computers (eg, irs.gov, treasurydirect.gov, disburser.treasury.gov).