Hotel's official name: Conrad Washington DC
State/province/country: Washington, DC
Date of stay: July 2022
Your status (Gold/Diamond) at time of stay: Diamond
Type of breakfast offered (full/intermediate/continental; see wiki): F&B credit ($25 or $50 for 2)
Taken in restaurant or lounge?: Restaurant
Extra options (e.g., upcharge for full breakfast): n/a
Added your report to wiki?: no

Credit can be used in Estuary, Blue Willow (basically Estuary for breakfast/brunch), rooftop bar, or in-room. No problems in applying credit.