I've a website which has 2 languages: German (de) as default and English (en) as translated. I am trying to implement language detection functionality in the website using the extension "rlmp_language_detection" version 7.0.0.

What I want to achieve is, for the countries Austria (at), Switzerland (ch) and Germany (de), the website should be stay in default language German and for all others, the users in other countries should see the website in English.

I've added the below typoscript to implement this. But not working anymore;

plugin.tx_rlmplanguagedetection_pi1 {
    defaultLang = de
    languageAliases >
    languageAliases {
        de = de
        at = de
        ch = de
    }
    countryCodeToLanguageCode >
    countryCodeToLanguageCode {
        de = de
        at = de
        ch = de
    }
}
page.987 =< plugin.tx_rlmplanguagedetection_pi1

Can you please help me to solve the problem? Thanks in advance.