Discord.js slash commands .getMember() and .getChannel() are returning null even though the options are required

EDIT/SOLUTION: The Guild Members intent needs to be enabled on the developer portal and your bot's client must log in with const client = new Client({ intents: [..., GatewayIntentBits.GuildMembers] });

I have a Discord.js bot with this command definition:

const { SlashCommandBuilder } = require("discord.js");

module.exports = {
    data: new SlashCommandBuilder()
        .setName('removerole')
        .setDescription("Remove a role from a user. Officer use only.")
        .addUserOption(option =>
            option.setName('target')
                .setDescription("The user whose role should be removed.")
                .setRequired(true))
        .addChannelOption(option =>
            option.setName('gamechannel')
                .setDescription("The channel that is associated with the role to be removed.")
                .setRequired(true)),


    async execute(interaction) {
        await interaction.deferReply({ ephemeral: true });

        //collect member
        const member = interaction.options.getMember('target');
        console.log(`member is ${member}`);
        console.log(`user is ${interaction.options.getUser('target')}`);
        
        //rest of function...
    }
}

When I input this...

...this is printed:

member is null
user is null

And the rest of this function that relies on these variables throws an error because it's trying to read a value of a null. The slash command options are required, so they should have a value, but getUser() and getMember() are still returning null. I know I am missing something but I've changed it to be as close to the guide as possible which should work.

Why are the values null?

Make sure you enable the required intents, namely the GuildMembers and whichever other data you are using.

Which intents are available

What are intents