POA-89321 Subscription Migration freezing in Migrating state
Hotfix can be downloaded here.
Use pa_updates_installer (http://kb.sp.parallels.com/en/111323) to install this hotfix.
Also this hotfix will be installed automatically during upgrade to POA 5.5.8 via
To install hotfix manually obtain its distributive from the link above and follow instructions found in file UPDATE.txt of distributive.