Is there a direct sign-in URL, where I can prefill my account id, so that SSO users of my Identity Provider can access OVH by just clicking on the OVH icon in my provider and do not need to fill in the account id + "/idp" themselves?
No, unfortunately not
Something easy to do that is mandatory for SSO
+1, please implement this…
i agree. would be usefull
Yes, I'll also would like this very much