Hello,

I know that the sendAll method has been deprecated, but we have continued to use it due to certain circumstances.

Recently, even with the same request data, sendAll has been inconsistently succeeding or failing.

I resolved this issue by upgrading version and switching to the sendEach method,

but I'm curious as to why this inconsistency occurred with the sendAll method.

In my opinion, if a method is deprecated, it should not work, so I'm curious why it alternates between success and failure.

fail Error Message
Raw server response: \"{\"error\":{\"code\":501,\"message\":\"Operation is not implemented, or supported, or enabled.\",\"status\":\"UNIMPLEMENTED\"}}\""}}