The two-factor authentication step of the config flow checked whether the server URL started with a slash rather than ended with one, so a URL which already ended in a slash had another appended and the token request went to "//api2/auth-token/".
The two-factor authentication step of the config flow checked whether the server URL started with a slash rather than ended with one, so a URL which already ended in a slash had another appended and the token request went to "//api2/auth-token/".