Error producing PDF.
! Package inputenc Error: Unicode character 🔴 (U+1F534)
(inputenc)                not set up for use with LaTeX.

See the inputenc package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.174 ...ic light color emojis to communicate 🔴

Try running pandoc with --pdf-engine=xelatex.