The problem may be at the BigBlueButton serverserver level if by migration what really happened was that the server was installed in a new box/vm. If this is the case the recordings should also be moved from one BBB server to the other.
There is documentation in docs.bogbluebutton.org that may help you solve the problem, or more help can be asked directly to the bigbluebutton-setup google group https://groups.google.com/forum/#!forum/bigbluebutton-setup
JF