iCloud app

Hope someone can help.

I’m unable to access the iCloud Drive app.

i have an iPhone X and up until the last few days I have been able to acce the iCloud Drive via the app. This has now disappeared from my phone.

I have checked all all my settings, and can access this via the browser.

When I access the App Store this is the message shown.

Is there a problem with my phone, a setting I should check, or is it something else?