Hi, and thanks for reaching out. I am Zainab, an Independent Advisor and a Windows user like you. I'll be happy to help you out today.
I understand how important it is for you to resolve this issue. Nothing to worry I will do my best to help you out. There might be a background process or application using the files stored on the USB causing the error. Kindly follow the steps below to fix the issue.
Method 1: Restart the computer
If you have confirmed that all files and programs have been closed, you can restart your computer and try again.
Method 2: Run Windows Hardware and Device Troubleshooter
Open Windows settings > Update and security > Troubleshoot > choose Hardware and Devices, then click "Run the troubleshooter".
Your computer will start to scan your computer and install drivers and updates. After the process is finished, click "Apply this fix" to restart your computer.
You can check this link for reference:
https://www.easeus.com/resource/problem-ejectin....
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
I hope the above information helps. Please let me know how it goes.
Best Regards,
Zainab.