Trending @Accenture; Resignation process in Accenture

Hi All, I got a offer from Infosys as they have accepted for 90 days notice period and wanted to keep resignation in Accenture and moreover my current app is getting finished, 31-07-2025 is the last roll off date from that app but in the same account they took me for another app and from 01-08-2025 I will be officially confirmed in that app. I want to send a mail to upcoming application manager and the current manager regarding my resignation and please help me where I can initiate the process.