Transaction not yet indexed

MtmbUTi8dR38VHzcJRu6C2rCEZKAKBKRFwcf4iE7ckCSw5QtqrbprzhVSJ6TERdYZnShcDu3QZU4rQBYNYUxBKZ

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