As a test, when opening a project, SQL/MSDE step, select create a new database and see if database is being created. If it is, then the problem is with SQL database limitation on SQL Express and not with the service account credentials.
To resolve the issue, please make sure to either upgrade SQL Express to the full blown SQL version, or migrate the database to the full SQL server and reconfigure the project with the new SQL server.
It's also recommended to build a fresh MAGE agent host, assign necessary roles (mailbox, calendar), then switch a collection to the new MAGE.
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