Games are available in line with the geo-restrictions set by EFL. If you receive this message or unable to purchase the pass, the game is not available in your country or territory.
If you’re outside the UK on holiday and trying to access the stream via mobile data (3G/4G/5G), your IP address is still registered as being in the UK despite roaming due to the way roaming mobile service works. Connecting to a local WiFi network should solve this.