Depending on how old the version of the Advanced Scene Switcher is, which you were previously using on your old computer, and if you imported the settings or manually recreated the macro, a different implementation of the HTTP action might be in use now.
Can you give this build a try, which should be done in a few minutes?
It changes how the http parameters are handled.
An automation tool for OBS Studio. Contribute to WarmUpTill/SceneSwitcher development by creating an account on GitHub.
github.com
Unfortunately, you will have to be logged into GitHub to be able to download it.
If that is a problem let me know and I can try to share it some other way.