Rejected because of negative feedback from employer

I got offer from Capgemini and I put down the paper in last month and today the background verification team has reject my application because of negative feedback back from previous employer .

Issue was I left the job for higher studie in Nov 2023 s and after I got offer from.accenture urgent requirement so I joined ..

That's was the only seen ,but employer give negative feedback to Capgemini and in between they have revoke the offer