Hello brendon-pmc,
It's good to see that you've already undertaken some troubleshooting to see what might be causing QuickBooks Online's search feature to work for some users but not others. With what you've described, it definitely sounds like a bit of a strange situation, and I want to ensure that this is addressed so that everyone can use the search option as needed.
When it comes to issues like this, checking if it's all or only some users having problems is the perfect place to start. Since you're seeing only two users having this issue, it could be a problem with their user access overall. A step you can take to troubleshoot this is to remove and then re-add their user accesses to see if that resolves the problem. Here's an article that can help: Add and manage users in QuickBooks Online
If that doesn't do the trick, I recommend reaching out to our technical support team for further troubleshooting. This will give us the chance to clarify which users are having this issue with the search feature, what exactly has stopped working with it, and go through additional troubleshooting steps based on that information. Here are the ways to get in touch.
Schedule a Callback or start a Chat: click (?)Help in the upper right in QuickBooks Online > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.
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Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.
We're here and ready to help further!