bing AI has been popular recently and with the long waitlist adding majority of the weight to the popularity and the hype itself. Microsoft previously announced that there are going to reduce restrictions and increase the waiting list to invite more people who are willing to join the early testing of the new bing.
Alongside of only limiting the use of bing AI through Microsoft edge and bing browser, Microsoft will now allow every user to directly use the new bing thorough the windows taskbar as the AI gets integrated into the search bar itself for the ease of access.
But still being in the early stages of development bing AI can be only accessed through Microsoft's Edge and bing browser that is only available for mobile devices as of now, To access bing from from your desktop you will be required to log in from Microsoft Edge browser.