When signing in through an OAuth/OIDC provider failed, for example because the provider denied access, the account had no email or its email domain was not allowed, the login page told the user their email or password was wrong, even though they never typed one. Every such failure now shows "Sign-in with your identity provider failed. Please contact your administrator for assistance." The text is the same for every cause so it does not reveal which check failed, and the exact reason is still written to the server log as a warning.
Fixes#31627
The web search error message was a lambda with a passthrough branch that returned whatever it was handed. Since #28942 both call sites pass no arguments, so that branch is unreachable, and it is the trap that let a caller drop a raw exception object into an HTTP response body and turn an intended 400 into an unserialisable 500.
A plain string constant removes the trap and lines the message up with every other fixed message in that file. Behaviour is unchanged: the response detail comes out byte for byte identical, because the enum already overrides __str__ to render members as their value. Verified on Python 3.11 and 3.12, both producing the same string and the same JSON body.
Classic298