The following conditions need to be met in order to use the HD Retouch feature:
1. Your BeautyPlus Premium subscription is valid.
2. The network connection of your device is stable.
3. The photo you are editing clearly shows a complete face.
4. The date & time setting is correct in your device.(Please enable "Set Automatically" in the iOS system by following this path: Settings > General > Date & Time > Enable "Set Automatically")