S
Strange I was an early beta tester maybe I need to re do itI've just tested this just now and it does delete everywhere for me. I opened the desktop app I have on my Windows 10 laptop (the beta version) and deleted a single message (there is ONLY the option to 'Delete for me' - there's no option to 'Delete for everyone' as there is in the non beta version).
I then went to the same chat thread on my app on my iPhone 13 Pro and the same message was no longer there.