I see Amazon and Amazon-Fire TV as a option when I use the codefinder for the XR15 but it asks for a model number. I try to put in some I googled but it doesn't work. You have to type in Amazon as it isn't found in the first drop down.
I think URC is prompting for the model numbers of the original Amazon Fire TV sets.
I read an article on Consumer Reports and various manufacturers have made Amazon sets since 2018. Best Buy sold the first sets branded as either Insignia or Toshiba but to offer a "better Fire TV experience," Amazon is now branding their own to be compatible with Alexa, Echo, etc.
Although Amazon claims these sets are "Amazon-built," Consumer Reports notes its design and specifications are very similar to TCL sets, and Amazon also announced Pioneer will make low-budget versions.
Amazon is assembling these sets, but I think they're assembling with components from other brands. TCL seems to be a clue.