On Thursday, January 26th, January 2023 I received an offer letter with a start date for a new company. On Friday, January 27th I put my two-week notice in at my current employment. Today January 29th I received an email from the company that hired me saying they have decided to move on to another candidate. Can they do that? Why would they? Am I allowed to find out why? So now I don't have a job. My current employer has let me go since I put in my notice.