My IMAP mail suddenly stopped working

On my iPhone and iPad, IMAP stopped working for my Zoho account with the error "User name or password incorrect" and "Invalid credentials failure" however I was able to access via web with the same credentials.

Also stopped working on Apple Mail client. I double-checked all the settings on the desktop and on the phone, and all seems to be in order, yet I still keep getting that error. What gives?

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