Notice Period Payment Considerations
What is the amount you paid as a notice period? That exact amount should be requested from your present employer.
Remember that negotiating for a 6-day salary or notice period payment, especially when you have just joined the company, may ultimately mark you as a problem creator in the confidential file. You don't know whether the company's culture will match your expectations. Similarly, you can't be certain if the company's expectations about you will align with the skills you bring. Simply put, you have not yet overcome the risk of your decision to leave the old company and join the new one. At this moment, negotiating over a few days' pay may create a negative impression.