[tootie]

I can absolutely confirm that Edge is blocking sites based on spurious signals. One of mine is still getting a similar warning. We were given an explicit reason, namely that a form action was pointing to a different URL that looked suspicious. The URL was an API service that we also operate. I followed up with their support who said they couldn't remove the warning unless I sent a link to a page on that URL they could look at. I replied that it's an API server and does not have any pages which got no reply. Besides the fact that that's a terrible test of authenticity. We could easily apply a DNS TXT record or something but it wasn't offered as an option. MS are definitely in the wrong in my case and the only solution is to change our implementation and cross our fingers.