Migration Status: Error
Just like everyone else, this new email thing is a PROBLEM. I am trying to work, using my business email and I'm leaving the country on Friday for a month. I need my email to function! At the moment, I get the following error message:
Migration Status: Error
I can't log into my email on my Apple Mail on either my computer or phone. All of my fancy signatures, pre-set email messages, etc, are in Apple Mail. Using the Yahoo app and browser interface are NOT useful to me. Please help me get my email working again before I leave the country. This is quite the disaster...

We cannot help with Small Business inquiries here, that team has their own support systems and community which you can find here: https://smallbusiness.yahoo.com/
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Victoria Theodore commented
Also, when I am finally able to log in through my browser, instead of going to the mail page, it shows me the login page again, with the word "undefined" in the email field. Tragic...