on the left side of the screen  (VAT enabled)

on the right side,

1,  as soon go on to TAXes  it shows for one second  "Great Work …."

then

2, "Refrest your VAT centre to stay connected to HMRC"

below that it says "The connection to HMRC has stopped working"

then   "Refresh now"   

I did that and ….

3."We can't connect to HMRC right now"

if look at open returns "Status" is "Blocked"