Unable to set Mobile device wifi restriction

Unable to set Mobile device wifi restriction

In Restrictions -> Network and Roaming -> wifi , when I try to set Always Off I get a warning saying "You cannot allow Disabling of Cellular Data and simultaneously keep Wifi Always off, due to a requirement of internet connectivity for server-device communication"

Whilst I understand this, there isn't a setting available for ensuring data is Always On. Thought there used to be though?

DC ver 10.0.291

Can anyone help?

Thanks

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