Chat plugin for AMP on mobile ?

Title basically, what chat plugin are you using for your amp version of your website (we use non amp for desktop and tawk.to works just fine). Since we using amp on mobile, tawk.to does not work so we had to switch to facebook meta messanger. This was a horrible experience, to say the least, facebook constantly crashing when you are logged in to the business.facebook.com domain even after clearing cookies, no sound notifications and so on and so forth.

Does any of you uses live chat wordpress plugin sucessfully on amp that is not related to facebook meta messanger, or if you use meta’s messanger did you got sound notifications to work properly (atm whenever we get new messages we get new message notifications, but you cant see it and get notified unless you are on that very page).