Zoho Mail Won't Connect to ANYTHING!!!

Zoho Mail Won't Connect to ANYTHING!!!

I have tried two Mozilla Firefox extensions configured for IMAP, as well as Mozilla Thunderbird, and I have tried K-9 Mail for Android as well as my stock email app for Android. NONE OF THESE HAVE WORKED!!! I have set up each and every one of these with the EXACT specifications as listed here, and Zoho Support, despite me sending two different messages through the support dialogue over the course of a few days, has yet to reply!

I'm about at my wit's end trying to work with Zoho Mail and this is inexcusable! I'm about to switch at this point to another email provider!

WHY WON'T IMAP WORK?!!!