Transaction not yet indexed

MM2zKEKRJAaMQhP1AUuuSSECsShEDyxmAnjgtB5qq3zV1qdWx4WMgYcnQ6U9GyT1mLvuriUmfD7YqY3UHPQn3cT

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