Thank you for posting your inquiry here in Microsoft Community, Kimberlie Gonzalez.
I'm sorry to hear about the Pen issue. I can definitely feel how important this pen, specially for a project. I will do my best to assist.
May I confirm what type of Surface Pen you are using? You may use this article to help you identify the pen that you have: Identify your Surface Pen and features.
Please perform the methods below;
- Run Surface Diagnostic Toolkit and check Windows Update.
- Run the Using System File Checker.
- Reseat the pen tip, and test on the app.
- Try to change the battery of the pen and see how it goes.
If the issue still persists, please reach out to the Customer Support to get a replacement Surface Pen. Visit our contact us page; https://support.microsoft.com/en-us/contactus/ to contact Microsoft Surface Support. If you're located outside the United States, you can check our Global Support Contact page; https://support.microsoft.com/help/4051701/.
What "Test on the app"?