Trending @Cognizant; Notice period related doubt

Can't I take leave while serving notice period ( I am talking about sick leave only)? And My manager is not agreeing to give me an early release. But I want my 90 days notice period to deduct from my earned leaves (22.5 days). Even if they are not giving me any early exit in that case ...will they pay me for my earned leaves? Please resolve my doubts if possible 🙏