Currently, element uses/_matrix/client/r0/keys/signatures/upload instead of the newer and correct /_matrix/client/v3/keys/signatures/upload route. As a result, attempts to set up key backup on the Conduit implementation of Matrix, for example, throw errors.
Currently, element uses
/_matrix/client/r0/keys/signatures/upload
instead of the newer and correct/_matrix/client/v3/keys/signatures/upload
route. As a result, attempts to set up key backup on the Conduit implementation of Matrix, for example, throw errors.This has also been documented and fixed for FluffyChat: https://gitlab.com/famedly/fluffychat/-/issues/986.