try to get conditional to work 8

Author: mattip

azure/posix.yml

@@ -18,6 +18,7 @@ jobs:
     strategy:
       matrix:
         ${{ insert }}: ${{ parameters.matrix }}
+        AZURE_PYTHON_VERSION: ${{ coalesce ( parameters.AZURE_PYTHON_VERSION, parameters.MB_PYTHON_VERSION ) }}
 
     steps:
       - checkout: self
@@ -27,10 +28,7 @@ jobs:
           set -ex
           echo MB_PYTHON_VERSION $MB_PYTHON_VERSION
           echo AZURE_PYTHON_VERSION $AZURE_PYTHON_VERSION
-          AZURE_PYTHON_VERSION=${AZURE_PYTHON_VERSION:-$MB_PYTHON_VERSION}
-          echo now AZURE_PYTHON_VERSION $AZURE_PYTHON_VERSION
-          echo "##vso[task.setvariable variable=AZURE_PYTHON_VERSION]$AZURE_PYTHON_VERSION"
-        displayName: Set AZURE_PYTHON_VERSION
+        displayName: Debug stuff
 
       - task: UsePythonVersion@0
         inputs: