Menu Accessibility Issue – Collapsed state not announced

Hi,
On my site – https://bowl360.nyc/ – I have a collapsed menu but it is causing accesibility issue – see message below

– The Navigation menu has elements with drop-down menu, and they do not announce their state – “collapsed” or “expanded”. As a result, assistive technology users do not know what part of the Navigation menu they navigate or if they skipped sub-menu links.

any ideas how to fix this?

thanks in advance