Cannot log in to Zotero app

Hi all.
I just got a new computer (oh, the joy. not) and while I can smoothly log in at Zotero.com, I cannot get the preferences/sync panel on the Zotero app to accept my log in. No error code or anything, just a dialog pop up stating "invalid username and password".

Any ideas how to get Zotero to let me at my Zotero library?

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