Outlook app on IOS defaults to 365

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Hi

We've got a weird problem here for one particular user. Her email is defaulting to 365 on the IOS Outlook app - you can't set it up with her Exchange.

We tried another Ipad and still the same. Tried deleting her 365 account and re-creating it again - but it's still the same .

 

Can you think where the setting might be where this is happening? We've tried it on a phone ( Android ) and it is still defaulting........we've been searching all afternoon and come up with nothing.

 

Either it's in the profile somewhere........any ideas gratefully received.

Thanks