Lost institutional access, cannot update email for account

My zotero was connected to my graduate school institution, but since graduating, I no longer have access to this email. In order to add a new email address or sync my library on a new device, Zotero is asking for multifactor authentication, which is being sent to my no defunct email address. How can I add a new primary email address (and sync to a new device) without being logged in?
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