Did you upload the migration library on your tenant before? It's a requirement that the library is available from BIMcloud to get all the objects right (even though this is a library that probably everyone has untouched within their own Archicad, there's still a possibility to modify the objects, therefore it is safer to use a 'standard version' from the server which will be the same for all participants).
If you didn't upload, you can do it by sharing an empty project where the library is linked (see: Libraries Setup for Teamwork Project Sharing).
Another possible obstacle could be that the migration library is already available on BIMcloud, but it is located in a folder where you have no View item access. To be able to use a library, you need to be able to see it on BIMcloud. Usually that's why it is recommended to upload it to a shared space where everyone can get access and keep other data separately where you might want to modify the visibility of content.
Noémi Balogh
Community Expert, Admin
