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Hi,
The "extension is not available for your country" error is the classic mismatch between the W1 environment country setting and the AppSource availability of the UK localisation extension. Since v27 Microsoft moved UK localisation into extensions on top of W1, but the environment country must still be set to United Kingdom for AppSource to allow the deployment. On a pure W1 environment, the Making Tax Digital app refuses to install, exactly the error you see.
The cleanest fix is to change the environment country to United Kingdom in the BC Admin Center, on the environment properties. After that, the UK localisation extensions become available on AppSource for that environment, including Making Tax Digital. The existing data stays, the country flag just unlocks the UK-specific extensions. This is the supported path Microsoft is pushing with the new localisation setup.
If for some reason the country cannot be changed, for example multi-country tenant or shared environment, the alternative is to install only the Making Tax Digital extension manually through Extension Management with the Upload Extension function, taking the .app file directly. Some partners do this for international clients who need MTD but cannot switch the country. Not the official path, but it works.
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