.custom(isUserNotificationSettingValid).withMessage('Should have a valid new user registration notification setting'),
body('newInstanceFollower')
.custom(isUserNotificationSettingValid).withMessage('Should have a valid new instance follower notification setting'),
.custom(isUserNotificationSettingValid).withMessage('Should have a valid new user registration notification setting'),
body('newInstanceFollower')
.custom(isUserNotificationSettingValid).withMessage('Should have a valid new instance follower notification setting'),