Is it the dbl quotes.

Author: sipsorcery

.github/workflows/datachannel_echo-test.yml

@@ -57,7 +57,7 @@ jobs:
       - name: Record result
         run: |
           echo "Result for ${{ matrix.server }} server and ${{ matrix.client }} client, outcome ${{ steps.check_connection.outcome }}, result ${{ steps.check_connection.outputs.TEST_RESULT }}."
-          echo "RESULTS+=['${{ matrix.server }}','${{ matrix.client }}','${{ steps.check_connection.outputs.TEST_RESULT }}']" >> $GITHUB_OUTPUT
+          echo "RESULTS+=['${{ matrix.server }}','${{ matrix.client }}','${{ steps.check_connection.outputs.TEST_RESULT }}']" >> "$GITHUB_OUTPUT"
           
   # Job Description: Collates the results of the interop tests into a mark down table.
   collate: