Do not sync Android and Laptop

Android and Laptop are not synchronized via QR-code, it is simply not scanned through the browser-built-in scanner application. And through the text too. Now I try the laptop with Android, I hope it will work out. Nothing succeeded.
Android 7.0 (1.0.99)
Laptop Linux Xubuntu 18.04 (Version 0.66.99 Chromium: 75.0.3770.100 (Official build), (64 bit))

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