The best source of APN settings is online at https://apnsettings.org and the best way to search for them is to do a Google search like apnsettings.org UK Vodafone 2022 as the search facility on the website is not great. If the default Auto APN setting on the 4GXtream does not work, manually set the APN settings for your SIM card and save them.
If they are correct, you should see the Data Connection in the STATUS>OVERVIEW page (see above) shown as Connected and in the NETWORK>WAN page, whichever MOB SIM Slot you are using should have an IP address – in the example below MOB1S2A1 has IP address 10.44.45.58/24