Open your Huawei AppGallery and search for NowServing by SeriousMD.
Look for the Results from Petal Search at the bottom, you should be able to see the NowServing app.
Download the APK.
A prompt like the one below will appear. Click the DOWNLOAD option. You do not have to worry, it does not contain any viruses.
Allow all permissions and click INSTALL.
After installing, go to the NowServing app info. Scroll down and click on the OPEN BY DEFAULT option.
On the "Open supported links in this app" tab, choose ALWAYS ALLOW.
And you're done!
You can now use the NowServing app on your Huawei device! 🥳