I can confirm, I get the exact same behaviour. When I want to open the help page, I get the cookie banner. It doesn’t matter wether I accept or reject the cookies, I will always get the “Something went wrong” page.
Also interesting: When I hide that cookie banner via developer tools in the browser, I still can’t send messages to the chat, because requests will be denied.
I tried multiple browsers (Chrome, Safari, Firefox) on my mac and Safari on my iPhone. I tried private browsing sessions and regular ones. I don’t have any third party tools (like adblocker) active. Just the standard browser configs.