404 for deprecated endpoint
@@ -118,8 +118,7 @@ is rotated.
## Fallback considerations
`v1` versions of these endpoints may be disabled at the discretion of the
-implementation, and should return a HTTP 400 with a `M_DEPRECATED` `errcode` if
-so.
+implementation, and should return a HTTP 404 if so.
If an identity server is too old and a HTTP 404 is received when accessing the
`v2` endpoint, they should fallback to the `v1` endpoint instead. However,
