I have attached a launch picker to a button so it would bring up the date picker when the corresponding button is pressed. In live it isn’t doing anything however.
can you attach a screenshot of the code?

Those blocks work for me on an iPhone 11 in Thunkable Live. I tap the button and the date input appears. I then tap the date that appears and tap a new date, and then tap confirm. That new date is displayed as the button’s text.
I should note that I only tried it in the web preview since I don’t have the phone with me right now.
When you wrote “live”, I assumed you meant Thunkable Live. A web preview is different, of course, and in this case the date picker won’t launch that way.