Why i am getting bad credentials error while trying setup fb messenger?

:bullseye: What is your goal?

i am trying to connect my facebook messenger with meta app created in developer portal.

:thinking: What is the problem & what have you tried?

i am getting a bad credentials error everytime i paste access token in the “send a messeage” module. it was working before but now giving this error. even i have tried multiple make accounts to test this first but not working anywhere.

:camera_with_flash: Screenshots (scenario flow, module settings, errors)