I am unable to add any expenses or invoices to new projects created. I keep getting a "Sorry, an unexpected error has occurred. Please try again"

I'm here to lend a hand, gamal.

We have received reports about this in which our Product team is working to validate the issue you have reported. 

While we're working on this, it would be best to get in touch with our Customer Care Team. They can add you to the list of affected users. 
 

Here's how to contact Customer Support Team:

1.     Click the Help icon on the top right.
2.     Click Contact Us button at the bottom.
3.     Enter a short description about your concern.
4.     Click on Let's talk.
5.     Choose the method on how you'd be connected to support.

Check out these screenshots for your visual guidance:

When we have more information about the status of this issue, we will update you. We will send the updates on your email address associated with your Intuit account.

I appreciate your patience and understanding as we continue working toward a resolution. If you have any follow up questions, please let me know. I'm here for you. Have a great day.