I found the solution: 1. Open TeamViewer Host app (preferably the newest) on 'slave' Android device, log into your TW account. 2. Open TeamViewer for Remote Control app on 'master' Android device. MOST important step: click on 'Computers', and here also LOG INTO YOUR ACCOUNT. After logging in, click on 'Own Computers', find the 'slave' Android device, click connect. You are good to go - no password requirement, nothing.
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