protected async getByUsername(username: string, appId: string): Promise<IUser> {
        this.orch.debugLog(`The App ${appId} is getting the username: "${username}"`);

        // #TODO: #AppsEngineTypes - Remove explicit types and typecasts once the apps-engine definition/implementation mismatch is fixed.
        const promise: Promise<IUser | undefined> = this.orch.getConverters()?.get('users').convertByUsername(username);