[philo23]

Just a guess but why do I get the feeling it’s because someone who setup sei.co.jp in Azure Entra (aka Azure AD) some how managed to add/claim the domain “example.com” against their companies tenant.

It’s clearly not using the DNS records for discovery because they don’t exist, the only other option I can see is some weird fall through or hard coded value and it seems like an odd one to pick.