Additing addition email accounts - iPhone

Additing addition email accounts - iPhone

Hi there.
I'm trying to set up my new iphone and have downloaded the zoho mail app. I've managed to login to 1 email address, but I also monitor 2 other addresses and need them on my phone too. Every time I press "+ account", it says "fetching your account" and takes me back to the same screen. Am I doing something wrong, or is it not actually possible to add a 2nd or 3rd email account to the app?

HELP please! 

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