Can't access monzo business on iphone 4 ios 7

[Revels]

Hi. Welcome.

Is this a new issue for you? Have you just have to use a backup phone? That will be 8 years old soon.

From this thread..

An update on iOS9 support

TL:DR When the prepaid program ends in early 2018, we will also remove support for iOS9. Customers will need to update to iOS 10 or above in order to upgrade to the current account. Those who haven’t upgraded to the current account will need to close their prepaid card, and we’ll refund their remaining balance. We’ll be posting an update about the timing of the prepaid program ending soon. Details As you may have seen, we are planning to remove support for iOS9 (and the iPhone 4S) when we e…

Monzo stopped supporting iOS9 a few years ago. So I’d say that’s probably why.