Trying to build slack automation, unable to types usernames of leads

I am trying to build a slack automation to send messages, but after clicking on “new message” button, it doesn’t type out the username i have given in the csv. I see its not able to bring cursor on “to” section where it needs to type the username.

however it is able to read the username from the csv, and it says this in the logs: Line 6: timeout reached when looking for element ‘U06PECCL5KJ’

Any help on how to select the “to section” please, im unable to find that element by clicking on inspect…