Preview:
if(
  isnull(ri!userId),
  "User Not Provided",
  if(
    rule!usernameexists(ri!userId),
    user(touser(ri!userId), "firstName") & " " & user(touser(ri!userId), "lastName"),
    "Not Found"
  )
)
downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter