Ok, me and the master account holder sat down and tried to resend this invitation link you suggested, but we couldn't find anything like that for the linked team member accounts. I still haven't found a definitive fix for this issue yet. Google Chrome and Microsoft Edge browsers BOTH do the same thing when logging in, where they say "we can't find anyone with [email]). Clearing website data fixes it for one login and it happens again the next day. I've narrowed the issue down to one exact cookie that's causing the issue by going through and deleting them one by one until it let me login and then double checking. The cookie file causing all the trouble is from intuit.com and the cookie is called "ius_session". I've even uninstalled and reinstalled my web browsers, rolled back windows updates, and uninstalled every single piece of software that was installed between now and last week when this problem started...