|We have noticed some possible issues with your contract with XXX Sites (Lead Generation Expert For Web Design Agency / ID # 3216XX99).|
|While we take a closer look, we will need to put your contract on hold temporarily.|
Please hold off on working on this contract through Upwork until we give you the all clear.
So, idk what happend, if there anyone who can reslove the issue?
The most likely reason is payment method failed during the last charge to your client's card.
You should hold working on the project until your client resolves the issue. You can also reach out to your client and update his about the email you received.