There is an alternative. You can access web.skype.com (in any browser), add Bing as a contact and then chat with BingAI there
This is so hilariously Microsoft. Let's do cutting edge AI research! But wait, this other department says we have to put it in a sidebar. A what? Who uses those anymore? Then another department is like wait, what about Skype? Who uses THAT anymore? And so now we have the latest chatbots locked behind video chat from twenty years ago...sigh lol