Transaction not yet indexed

UMNgkRDMBLiTmz8n3bp3sw1tizNvyCz1gJuf4rAuAh6YQyKrqyJyEejGUaJw7mJta466H5hGyicHeSE1WHPEbaZ

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