MBUX NOT WORKING

Hi My 2021 Marco Polo has a problem with the MBUX interface for the habitation area. When pressing the picture of the vehicle with the roof up the central screen is blank! Has anyone experienced this problem and, if so, what is the fix?

Check your leisure battery - if it's low charge, MBAC doesn't work

Thank you. The leisure battery was low and having plugged it in for 48 hours MBAC is now working