Moving Itunes from a Windows 10 to new Windows 11 computer

I have followed the instructions to a tee.

I moved the library and the MP3 original files to the new laptop as they are currently on the old computer.

When I shift click on Itunes I select the current library.itl Itunes Opens but cannot find any of the original Itunes MP3 files.

I have done this several times with no luck.

The only thing I think could be causing any possible issues is that my username is johnr in the laptop and john in the old desktop computer. I am afraid to change the user ID in the new laptop as other situations it might mess up if I do.

What can I do before I resort to creating a new library, importing all the 45GB of MP3's again and have to setup my Iphone all over again. At my whits end.

Thank you in advance