I don't have a broadband internet connection, I use my mobile phone as a hotspot. How can I connect my new fenix 7x saphire solar to garmin express?

I loose my internet connection when I want to register my new fenix pro 7x saphire solar with garmin express. I use my mobile phone as hotspot for my desktop computer to connect to the internet. Is there a possibility to connect/register my device in garmin express without broadband connection?