When an OEM server app fails to build, it may be potentially caused by another server licenses conflicting with the server OEM license. To resolve this issue, follow the steps below:

1. Close out of any instance of 4D

2. Navigate to the licenses folder (E.G. /Users/{user}/Library/Application Support/4D/Licenses

3. Create a folder called "temp"

4. Throw all licenses files to this temp folder

5. Open 4D > Licenses Manager

6. Reactivate the 4D OEM Server (4UOS) and 4D OEM Keys (4DOM) and Dev Pro (4DDP)

7. Try building the OEM client-server app again and see whether issue is resolved