我正在尝试在azure中新创建的db上重新运行迁移。db、user和所有特权都是从头创建的。我基本上授予用户所有操作权限，包括db admin角色的读写权限：（基本上都试过了）

EXEC sp_addrolemember 'db_ddladmin', N'myuser'
EXEC sp_addrolemember N'db_datareader', N'myuser'
EXEC sp_addrolemember N'db_datawriter', N'myuser'
GRANT SELECT, INSERT, UPDATE, ALTER TO myuser

但最终我还是看到了执行这个特定操作的错误(来自azure devops的日志）

2020-08-06T15:26:10.9511511Z Beginning Transaction
2020-08-06T15:26:11.0719834Z ExecuteSqlStatement ALTER TABLE [dbo].[ContextState] ALTER COLUMN [JsonContent] ADD MASKED WITH (FUNCTION = 'default()');
2020-08-06T15:26:11.2674256Z !!! An error occured executing the following sql:
2020-08-06T15:26:11.2675116Z ALTER TABLE [dbo].[ContextState] ALTER COLUMN [JsonContent] ADD MASKED WITH (FUNCTION = 'default()');
2020-08-06T15:26:11.2675549Z The error was User does not have permission to perform this action.