Hello, this lamp will go offline after a while, after a power outage. According to your description, when you press (turn Off) all the lamps are offline.
And in the untied mode, untying is only done on the physical switch, in the app it is not untied (this is direct control of the switch).
And in lesson 7 I looked at the method of connecting smart lamps to smart switches, it is completely suitable for your problem. Automation 2.0, lesson 7. Controlling Aqara smart lamps using switches (wired and wireless)