Transaction not yet indexed

mi8Ex5pmZAbXeZBPZmRsPVexm4wrHVrxwxdzLfZK1ZbKVcrqjUN9ct2Cm9SSyUNekRYkASjFP9Rz9nhQyYB5mD1

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