Cognizant — About my offer letter and Onboarding pre joining link

Address:

Warje,pune

Hi,
I am Akash Gajanan Duraphe
I Had got a link from onboarding team for acceptance the offer but this link redirects to my old microsoft account.I want to change my microsoft account for cognizant portal but there is no option to found for this and Yet my issue is not resolved And the team said the offer is auto matically declined.So I Can't be able to move forward for pre joining process.
My Personal Number:- [protected]
recruiter Team Partner Nelson :- [protected]