Command is not registering

import { ApplyOptions } from '@sapphire/decorators';
import { applyLocalizedBuilder } from '@sapphire/plugin-i18next';
import { ChatInputCommand, Command } from '@sapphire/framework';

@ApplyOptions<Command.Options>({
    description: 'ping pong'
})
export class UserCommand extends Command {
    public override registerApplicationCommands(registry: ChatInputCommand.Registry) {
        registry.registerChatInputCommand(
            (builder) => 
            applyLocalizedBuilder(builder, 'ping:CommandName', 'ping:CommandDescription')
        );
    }

    public override async chatInputRun(interaction: Command.ChatInputCommandInteraction) {
        await interaction.reply({
            content: 'Pong!',
            ephemeral: true
          });
      
    }
}