Connect Huawei Band 3 Pro with mobile phone?

I have the Huawei Band 3 Pro fitness bracelet since today and can't cope with it. On the clock I'm supposed to scan a QR code to download the app Huawei Health. Now I've downloaded a Wear app and the health app from the Play Store, but the apps do not offer my watch for pairing.

I tried to find out what I can do with Google but it did not help… If any of you happen to have this clock can it please tell me how it can connect to my Huawei p20 per phone?

And why do not you scan the QR Code?

Because I do not know how that works?

With a QR code scanner ♂️