If you have a Huawei Mate 10 Smart Phone which was from China. You will have to install Google Play Store to get apps such as YouTube, Google Map etc.
Installing Google Play Store is not a problem for Huawei Mate phone at all. You do not need to root the phone, just directly install Google Play Store on Huawei Mate 10:
1: Open Huawei App Store, its name is AppGallery;
2: Search out Google Play Store, install it or Update it;
That’s it !
For more details installing steps, please check this post (How to Install Google Play Store on a Chinese Huawei Mate 10).