diff --git a/action.yml b/action.yml
index 5be41ee..bda3731 100644
--- a/action.yml
+++ b/action.yml
@@ -108,15 +108,16 @@ runs:
 
         if [ -n "$INPUT_SERVICE_ACCOUNT_KEY_PATH" ]; then
           STACKIT_SERVICE_ACCOUNT_KEY_PATH="$INPUT_SERVICE_ACCOUNT_KEY_PATH"
+          export STACKIT_SERVICE_ACCOUNT_KEY_PATH
         else
           STACKIT_SERVICE_ACCOUNT_KEY_PATH="$(mktemp)"
+          export STACKIT_SERVICE_ACCOUNT_KEY_PATH
 
           echo "Writing STACKIT service account key to $STACKIT_SERVICE_ACCOUNT_KEY_PATH"
-          echo "$INPUT_SERVICE_ACCOUNT_KEY" > "$STACKIT_SERVICE_ACCOUNT_KEY_PATH"
+          printf "%s\n" "$INPUT_SERVICE_ACCOUNT_KEY" > "$STACKIT_SERVICE_ACCOUNT_KEY_PATH"
         fi
 
-        STACKIT_ACCESS_TOKEN="$(stackit auth activate-service-account --service-account-key-path "$STACKIT_SERVICE_ACCOUNT_KEY_PATH" --only-print-access-token)"
-        export STACKIT_ACCESS_TOKEN
+        stackit auth activate-service-account
 
         STACKIT_PROJECT_ID="$INPUT_PROJECT_ID"
         export STACKIT_PROJECT_ID