Nextcloud version (15.0.2):
Operating system and version (Ubuntu 16.xx):
$user not working in external storage after upgrading from 12 to 15
test with the real username instead of $user are working.
The output of your Nextcloud log in Admin > Logging:
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sensitive parameters replaced 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is temporarily not available"}},"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Android) Nextcloud-android/3.4.2","version":"15.0.2.0","id":"5c4ad01a3d665"}