Copilot Premium is purchased under working mail, how to change email linked to Pilot Premium licence after loosing access to working mail

I upgraded Copilot Basic to Premium under working mail and used Copilot for 4 months already (paying from my personal credit card). I would like to continue to use it (including paying for it), but I cannot find a way to do it after I will not longer access it via my working mail (because I am leaving the job). Anyone had the same issue and got it solved?

p.s. I am already passed trial period (7 days) when you can cancel for free. I am now in Year plan (until July 2027th) paying monthly fees.