I woke up and received an email from Google Merchant Center stating that one of my clients’ accounts presently does not meet one of the Shopping Ads Product Data Specification requirements. Specifically it’s about Inconsistent language between the feed and the website.
After a bit digging, the issue was caused by the additional language support (Google Merchant Center > Products > Feeds > Settings > Additional countries). We then removed the non-English speaking and requested for a account review.
The review process is pretty straightforward and it only took 2 hours for the warning to go away from our Google Merchant Center Account Issue tab.