Due to licensing restrictions, the European, US Domestic and Rest of the World products are managed by three different entities, meaning that subscribers cannot switch between the three services. If you're a subscriber with NFL Game Pass Domestic or NFL Game Pass non-European, and want to watch NFL Game Pass Europe, you will need to purchase a separate subscription, and vice versa.
If you purchased NFL Game Pass while living or travelling outside of Europe (a full list of the countries covered by NFL Game Pass Europe is here - Where is NFL Game Pass Europe available? you may be subscribed to NFL Game Pass Domestic or NFL Game Pass non-European.
To check if you have a subscription with NFL Game Pass Domestic or NFL Game Pass non-European, or you have a query about them, you will need to send your request direct to their customer service teams using the following link: