Zoho email

I've tried to add one of my accounts to an email client (Polymail IMAP) and everytime I type in my email address and hit return, the app crashes. This happens on my Mac, iPhone and iPad. I don't know if this post is private or I'd include more info on the devices/software. Oddly, my second Zoho email account was added to Polymail with no trouble. How can this be resolved? Thank you.