Search returns no (or limited) results.

Search returns no (or limited) results.

The Search tool in Zoho Mail is not working properly as of today.  When searching for a keyword I know to be present in nearly 100 emails, I'm getting zero returns.  For emails visible in my immediate inbox I'll search for a keyword that is present in several emails, but it only results in one return.

My search options are set to "Entire message" and "Search in all folders."