OCI-16627
There is no member available to support the protection mode.
Cause
Either there are no standby databases in the configuration whose redo transport mode supports maximum protection mode, or an operation is being attempted that will result in no standby database remaining to support maximum protection mode. This prevents the current operation from completing successfully.
Action
Ensure that at least one standby database has its redo transport mode set to SYNC mode before attempting the operation again. Alternatively, consider lowering the protection mode to maximum availability or maximum performance.