I fiddled around with the app for a long time. At random, it turned out to log in with the included VPN. The issue is on iPhone, but on Android it seems to be fine.
In addition to my thoughts, I've included some pictures that depict the highlights of my experience.
Lamp LED Yeelight Smart LED Bulb 1S, YLDP13YL, E27, 8.5 W, 6500 K
43 Review
Smart bulb Yandex with Alice, base E27, 8 W, RGB color
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LED lamp gauss Smart Home 1190112, E14, C37, 5 W, 6500 K
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Lamp LED Xiaomi Mi Smart LED Bulb Essential (MJDPL01YL), E27, 9 W, 6500 K
113 Review