Add account to iOS not working?

  • I have a MacBook Pro and have been using Vivaldi as a browser for a year or more.
    I have added the account to my email client Airmail 3. I do not use the native Mail app.
    I recently purchased an iPhone 7 and have the iOS version of Airmail 3 on that. My desktop version saves my account configurations to iCloud allowing me to quickly import settings for each account on the phone. All my other accounts including those requiring 2SV have added successfully but not Vivaldi. Despite the fact that the settings are exactly the same on both my desctop and iPhone I cannot add my Vivaldi email account to Airmail iOS.
    What am I doing wrong??


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