Option not valid in this context

Using FoundationDB
1

How to use READ_SYSTEM_KEYS?

fdb> option on READ_SYSTEM_KEYS
Option enabled for all transactions
fdb> get \xff/coordinators
ERROR: Option not valid in this context (2007)

Also, the C code fdb_transaction_set_option(txn, FDB_TR_OPTION_READ_SYSTEM_KEYS, NULL, 0) reports that error.

2

I see, if running above command not in tenant, it works.