According to the FDA, taking aspirin and ibuprofen (the active ingredient in Advil) together may increase the risk of side effects such as stomach bleeding and ulcers. It is recommended that you talk to your doctor before taking both medications together [2]. Healthline also states that taking aspirin and ibuprofen together can increase the risk of side effects and that it is not recommended to take them together unless specifically directed by a doctor [3]. Additionally, the Drug Patent Watch website lists Advil as containing ibuprofen, so taking Advil and aspirin together would be the same as taking ibuprofen and aspirin together [1]. Therefore, it is best to consult with a doctor before taking both medications together to avoid potential side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/information-about-taking-ibuprofen-and-aspirin-together
[3] https://www.healthline.com/health/pain-relief/aspirin-ibuprofen