Thanks for getting in touch!
Sorry to hear that you are having issues with moving your Octopus install to a new datacenter. As the migration process is very rigid would you be able to confirm some information for me?
Firstly, can you confirm that you exported your Master Key using the method outlined here? If you attempted to copy the key directly that would explain why you are seeing your current issue. Can you also confirm that you are keeping the versions consistent (i.e. you are not attempting to perform an upgrade at the same time)?
We have a documentation page that outlines the complete steps required to complete a move, so if you can review and double check that everything has been performed in the correct order that would also be very much appreciated.
Sorry for the 20 questions, just need to narrow down where the issue could be.
I look forward to resolving this issue with you,