UPDATE: Turns out I was on version 4.0.20, not 4.2.2. I have updated and it is working. Is that your situation @Joel_Mi ?
I am getting the exact same 404 error as noted above, despite being able to access the EVE Swagger Interface main page. I also tried manually accessing skill queue through the swagger site and it works. I was able to add the character, and it shows it in the list with an access token.
But then I keep getting “Error logging into EVE SSO” with the 404 message in the details noted above.
This is happening on a new install of Windows 11.
It is happening will all 8 of my characters.