I can not create a device with avdmanager command line:
$ Android/Sdk/tools/bin/avdmanager create avd --name Nexus6P --tag 11 --package \'system-images;andro
If you don't care about it being a Nexus 6P, you can run
echo no | Android/Sdk/tools/bin/avdmanager create avd --force --name testAVD --abi google_apis/x86_64 --package 'system-images;android-23;google_apis;x86_64'