async acceptChannelAdminInvite(channelId) {
        return await this.pupPage.evaluate(async (channelId) => {
            try {
                await window.Store.ChannelUtils.acceptNewsletterAdminInvite(channelId);
                return true;
            } catch (err) {
                if (err.name === 'ServerStatusCodeError') return false;
                throw err;
            }
        }, channelId);
    }
Accepts a channel admin invitation and promotes the current user to a channel admin
@param {string} channelId The channel ID to accept the admin invitation from
@returns {Promise<boolean>} Returns true if the operation completed successfully, false otherwise