When restoring a SQL DB, you may need to assign DBOWNER permissions to the DB
Here is a SQL query you can use to assign the needed permissions
DB name example: SurePassDB_202x
DB User name example: SPUser_202x
USE SurePassSurePassDB_202x
GO
CREATE USER [SPUser_202x] FOR LOGIN [SPUser_202x] WITH DEFAULT_SCHEMA=[dbo]
GO
DECLARE @Username SYSNAME;
SET @Username = 'SPUser_202x'
EXEC sp_addrolemember N'db_datareader', @Username
EXEC sp_addrolemember N'db_datawriter', @Username
EXEC sp_addrolemember N'db_ddladmin', @Username
GO