Transaction not yet indexed

MkKE8owD7AjYeMTSSQtiEqHhiK1LjKY1nJFkWUXaEpP4sTFyYJ7SWQKXKSbjjtUcbe8UqXYJjWQjZiBUCpnzAVJ

The transaction signature is valid but not yet indexed by this RPC node, or the transaction failed before inclusion.