For older scripts you need to Disable new App Script runtime powered by Chrome V8, navigate to Script Editor then from the Run menu ensure Chrome V8 runtime is disabled. When you close the script edit tab and refresh your sheet, the tools menu should appear at the top.
Google services need to be turned on for each script. Usually the script has the correct services active at the time it is built, but sometimes servies may need to be turned on or API versions changed. Navigate to Script Editor then from the Resources menu choose Advanced Google Services. From the dropdown ensure the API and version matches the endpoint you are connecting to. Changing versions may break the script and require a development to fix.
© 2019 Google Inc. - Apache License, Version 2.0