Hi, good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Your device's version of Windows 11 SE, a special edition intended for educational institutions and students, is made to be easy to use and secure. Even with administrator permissions, you cannot install apps directly, and the Microsoft Store is not installed by default. You can't install the Store manually on the said version of Windows.
I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed.
Kind regards,
John DeV
Independent Advisor