A request by itself should not be treated as a final outcome. Ask counsel to interpret the actual notice and its implications.
Respond to what was requested
The official FAQ notes that USCIS or the State Department may seek further information. Identify the unresolved point and evidence needed rather than assuming either approval or refusal. This guide does not predict how the agency will weigh the eventual response or advise a particular legal position without the notice.
Resist reading the request as a verdict in either direction, since it is evidence about what remains unresolved and nothing more. The useful response identifies the specific point the agency has been unable to settle and the evidence that would settle it, which is a narrower task than it first appears and is best done with the notice in front of counsel. Ask what the request implies about how the file was read, because that sometimes reveals a presentation problem rather than a substantive gap.
The official FAQ notes that the agencies may seek further information. This guide does not predict how a response will be weighed and cannot advise a position without the actual notice. Ask counsel what a complete response would need to establish, and work from that.