Transaction not yet indexed

Am66jLzxP8REmg3MmXvsabvEfnyDAxWCkbA8CjGfHyh7hVJcPHKySmCk3FPP1wqDobM3LqKArCaYCXw5JitLPqA

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