It seems the account that you run the installer needs...
Converted to topic from comment on https://voice.unifysolutions.net/knowledge-bases/7/articles/2937-installing-the-unifybroker-service#
It seems the account that you run the installer needs permission to create the database. The installer does not use the service account to do this, even when you select the Service Account in the Authentication screen when attempting a new install of the database.
Answer
Hi Daniel
Yes, this is by design for security reasons. The service account is what the Broker service operates under and should have its assigned permissions limited appropriately. The installer runs under the signed in account (presumably an administrator) who can have the expanded permissions required to create and configure the new database.
This Installation Prerequisites page details what permissions the service account requires.
Customer support service by UserEcho
Hi Daniel
Yes, this is by design for security reasons. The service account is what the Broker service operates under and should have its assigned permissions limited appropriately. The installer runs under the signed in account (presumably an administrator) who can have the expanded permissions required to create and configure the new database.
This Installation Prerequisites page details what permissions the service account requires.