After changing for Windows 11, my application cannot create a user instance SQL Server due to a failure to start the process for the instance user

Marcel Duboué 20 Reputation points


I already post my question at the tag SQL Server; after 2 weeks of work, they thing that the problem is due to the fact that my old application Visual Studio uses User Instances, which, for them is an old feature.
The message delivered is

User's image

And the beginning of the code, trying to open the first DB is

User's image

Please tell me your diagnostic, ans possibly any solution to recover my application

Thank you

SQL Server
SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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Windows 11
Windows 11
A Microsoft operating system designed for productivity, creativity, and ease of use.
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