Normally those use a different zigbee profile and are already linked to a difference zigbee network. I haven’t heard of anyone who’s been able to use one directly with SmartThings for those two reasons.
(edited to update However, as @kukuhome notes below, you may still be able to get access to the information from the smart meter, even if you can’t join the device directly to your ST account. But you will probably need to talk to your utility company to see what options are available for data access.)