Venu 3 hydration widget sync issue

Hi,

Just bought Venu 3 few days ago and really enjoying this watch! One little problem (unless I'm doing something wrong) - every time I add drink in hydration widget (by clicking one of cups) I get red exclamation at the top of watch, from what I understand it tells me that it can't sync back to phone?

I'm running Connect app iPhone 13 Pro and if I open app then it syncs fine. 

How can I fix this?