Which dua is not accepted?

Reasons for Rejected Du'a

A Du'a may not be accepted if it contains inherent weaknesses, particularly if it entails something inappropriate or displays a lack of respect towards Allah, may He be Exalted. Additionally, it is deemed unsuitable to request things that are prohibited. For example, if someone were to ask Allah to grant them eternal life in this world, or requests something sinful, such Du'as would not be accepted.