Hi,
Just run the Manager's configurator and set a new password for the masteradmin user.
Windows:
C:\Program Files\GRAHISOFT\BIM Server 20\BIMcloud Manager\BIMcloud Manager Configurator.exe
macOS:
/Applications/GRAPHISOFT/BIM Server 20/BIMcloud Manager/BIMcloud Manager Configurator.app
Kind regards,
Istvan
István Moharos
Manager, Technical Services
GRAPHISOFT