Try reinstall the app again by
1. Uninstall app
2. Reboot phone
3. Install app again

See if this helps

I'm giving you my fair assessment here (personal take so don't shoot me)
H7 as other skinned android will have these issue
1. Delay in android update (more to change than just plain launcher like htc)
2. Notifications may have hit and misses - H7 early build (B100) have issue with whatsapp contact sync but rectified with B120.
3. No 3rd party ROM

So there are few known things to expect (its not plain android that sure would not have issue) but looking at earlier honor devices there are updates and patches release by Honor to fix issues.

A very simple example is how H7 is secured and patch in regards to Stage fright but its not something you could say the same even on bigger brands like the Korean and Japanese brands.

They are trying to distance themselves from other Chinese manufacturer in the android and software space.