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Why am I being asked to authenticate a new device every time I log in on the same device?
To resolve this issue please do the following:
On Windows
Restart Steam
If the issue persists, exit Steam, rename your ClientRegistry.blob, and restart Steam. The ClientRegistry.blob can be found in your Steam installation directory. C:\Program Files\Steam by default.
If the issue still persists, you may have issues with your local Steam files. You may refresh these files without deleting your game files. Please follow this process to refresh your Steam files:
Exit Steam
Navigate to your Steam installation directory. (C:\Program Files\Steam\ by default.)
Delete everything in that directory EXCEPT the following:
steam.exe
steamapps directory (All of Steam's game files are kept here.)
Restart Steam to test the issue