If you still have access to the account you may be able to add an alias.
https://support.microsoft.com/en-us/help/12407/microsoft-account-change-email-phone-number
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Hi,
I've registered for Microsoft Azure Virtual Training as a private person but using my business e-mail account. In the meantime I lost my job and I don't have an access to this e-mail box anymore. The event will take place on 26.05.20 and the links to the training are supposed to be send to e-mail used during registration. I was looking for a possibility to contact someone who could change my e-mail but I couldn't find. Could someone advise who could help me and where I should ask for a help? Thank you!
If you still have access to the account you may be able to add an alias.
https://support.microsoft.com/en-us/help/12407/microsoft-account-change-email-phone-number