Transaction not yet indexed

Sx21RS4QY4DAVm3e9BTWgLaEHWec6xgfSxEGRGRvSYCXEKS2txVTq1Thg87vG4ikPMTuwQd2rgr4nDVfJmFNqiM

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