Windows 11 computer won't stay added to iTunes Match

Greetings, mmaic90.

If your songs aren’t syncing as expected, there are a few things you can try. 

First, navigate to Settings > Music on your iPhone. Then, ensure that Sync Library is on. Next, enable Sync Library for your PC.

“On your PC with iTunes for Windows

In iTunes for Windows, iCloud Music Library isn't turned on by default. To turn on iCloud Music Library:

1. Open iTunes.
2. From the menu bar at the top of your screen, choose Edit > Preferences.
3. Go to the General tab and select iCloud Music Library to turn it on. If you don't subscribe to Apple Music or iTunes Match, you won’t see an option to turn on iCloud Music Library.
4. Click OK.

If you have a large music library, it might take some time to upload and sync your music library across all of your devices.” Turn on Sync Library with Apple Music 

Also, be sure that you transferred the library using the following guidance:

“Restore from a backup

You can restore your iTunes library from your external drive to a computer. If you’re restoring an iTunes library from a different computer, make sure your new computer has the latest version of iTunes.

1. In the iTunes app  on your PC, choose File > Exit.
2. Locate your external drive (in File Explorer), then drag the iTunes folder you backed up earlier from your external drive to your internal drive.
3. Important: It’s highly recommended that you put the iTunes folder back in [User folder]\Music\iTunes\iTunes Media.
4. Hold down the Shift key while you open iTunes (go to Start, then choose iTunes > iTunes).
5. Click Choose Library.
6. Choose the iTunes folder that you dragged to your computer in step 2, click Open, then choose the iTunes Library.itl file inside.” Move your iTunes library to another computer

We hope this helps! 

Sincerely.