Your device is equipped with an eSIM:
Check now if an eSIM profile is installed/pre-installed on your device. Click on:
START > SETTINGS > NETWORKS & INTERNET > CELLULAR > eSIM Profiles.
At the top of the page, you can see which SIM card/eSIM are installed on your device Ubigi eSIM profiles will be displayed as TSL-1234 (ex: TSL-0131, TSL-0199, etc.).
If you have a Ubigi eSIM profile, click on the little arrow to display more options and click on USE to select it (click Yes on the displayed message).