Transaction not yet indexed

AmExqMdDAuR5zvxnfzUDroB6Us3c7CSymLmcAPBAj6j4FtVqDM5jjSTuVTMxn4nioXNwCc1djGHPy4Un6vDRcpQ

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