User handling in MS-SQL database

I have an MS-SQL installation, controlling different databases. This can be accessed using Microsoft SQL Server Management Studio 18. For doing that, I use Windows authentication. In there, I have different databases. One of them has the following permissions (while checking "Properties", "Permissions"): Users or roles: Name Type ANALYSE User Permissions for ANALYSE: Permission Grantor Grant With_Grant Deny ... Connect False False False ... Connect dbo True False False I have modified the "Grant" column checkbox, but that modification is not taken into account. I'm doing this because I want "ANALYSE" to be capable of accessing that particular database (I'm working with a connectionstring in a C# Entity Framework related program and I'd like to perform as least as possible source code modifications). When I access that database while having logged in as "ANALYSE" I get the following error message: TITLE: Microsoft SQL Server Management Studio ------------------------------ The database is not accessible. (ObjectExplorer) ------------------------------ BUTTONS: OK ------------------------------ Two questions: - In order to access that database, is it correct trying to check the "connect" feature in the "permissions" page? If not, what else do I need to do? - When I click a checkbox, how can I make sure that this gets stored instead of not taken into account? **Edit: screenshots for better understanding** As can be seen in the following screenshots, one "Connect" permission is granted, and all tables are indeed called "dbo.", nevertheless simply opening the database is not working: Permissions screenshot: The error message appears when I click on the + at the left of DB_Name: