Cannot Log on Using mobile Zoho on iPad

Cannot Log on Using mobile Zoho on iPad

I have used zoho mobile email on my iPad for quite a while. As of yesterday, instead of logging straight in I am tossed to an accounts.zoho login page where my correct information is displayed. But it won't log in. My desktop mail and crm still works, although the mail was stopped yesterday and the update is a little wonky.  Is there an app I am supposed to download? I have updated my CRM app for the iPad- it seems to have NO email capability, though.