iOS SDK 18.10 with Xcode 10 support has been released. https://my.workspaceone.com/products/Workspace-ONE-SDK/iOS/v18.10/awall
EDIT: The link has been updated.
I just downloaded this build 18.10 and it has the same error noted at the beginning of this post.
Also, the Product Guides link on the URL you reference is broken: https://docs-preprod.vmware.com/en/VMware-Workspace-ONE-UEM/services/VMware-Workspace-ONE-SDK-for-iO...
Lucas, same situation Xcode 11.4. Any updates?