According to the docs, the extension won’t render until the broadcaster, who uses the extension, has configured it. Source:
If you do require configuration, the extension won’t render until the broadcaster has configured it. In this case, you must specify versions of the broadcaster and developer configuration segments in two places. First, set the required versions on the Extensions manager Capabilities tab. Second, on the extension side, set versions when you set configuration (via the helper method or the API). Note that these two settings are compared when the channel is loaded. If they do not match, the extension will not load.
If you have already done this, or are not even able to reach that far to configure it, maybe this endpoint helps you: Extensions Reference | Twitch Developers
I dont know if this really is what you are looking for. So please specify a bit what you want to do, what you expect it to do and what it actually does
always tells “required configuration”
Where does it say this? On the webpage or when you try run your code? Maybe this example project may also help you: GitHub - twitchdev/bot-commander: React based frontend only extension sample that leverages Configuration Service It uses the configuration service.