Welcome to Android Central! Not all phones support the Move to SD feature. And for phones that do support it, not all apps can be moved. If you go to Settings>Apps, select apps, and never see a Move to SD button, then the phone doesn't support it. You'd have to try rooting the phone and using Link2SD or App Mgr III.
I believe Huawei doesn't support Adoptable Storage, either (which is the ability in Marshmallow and above to format an SD card as part of Internal Storage).