I’ve noticed that people tend to panic if their frog doesn’t defecate constantly. Since you’ve only had it since Sunday I wouldn’t be so concerned yet. The Ceratophrys genus does have slower metabolisms than other genera and species. I’d give it time to acclimate. Also depending on the size of the dubia it may take longer to pass. Male dubia with wings take a bit longer to make their way out from my own observations. Can you describe your setup and the size of the frog? Do you have a dish in the enclosure that the frog can choose to soak in on its own? What type of substrate are you using and how deep? What is the temperature? Do you have a temperature gradient?