Never seen one... excellent!The photo shows the included factory mobile charger.
Totally out of Spec to what the Rivian manual says it supports, but I'm glad it works. The EVSE probably thinks it's 240v (determined based on plug type, not electrical current), and is just letting it pass.
This also makes me think I can get my l6-20 outlet to charge at 16 amp with the factory EVSE by converting it to a 14-50 plug.
I assume this is https://www.evseadapters.com/products/tt-30p-to-nema-14-50r-ev-adapter/