Hi there, @jjakobovic. 

Thank you for reaching out to the Community. It's my priority to help you sort this out.  

Generally, when a user encounters unexpected behavior, we can perform basic browser troubleshooting to fix the issue. 

There are times that the browser is full of frequently accessed page resources, causing some unusual responses. We can start by accessing your account in a private browser. This mode doesn't save your searches, visited pages, log in details, and cookies.  

You can use the shortcut keys that I've listed below.
 

• Ctrl + Shift + P (Internet Explorer or Firefox)
• Command + Shift + N (Safari)
• Ctrl+ Shift + N (Google Chrome 

Once you're in, let's try again to go manage users and double-check. If we're able to view and delete it, we'll have to go back to your regular browser and clear the cache to get rid of the accumulated site data. Clearing it will refresh the system, and you'll be able to work with clean trash. However, if the issue persists, try using other supported browsers. It could be that the one you're currently working on has a temporary issue with QuickBooks. 

However, if it is still unable to show, I recommend reaching out to our Customer support team, as they have the tools to pull up your account in a secure environment and to determine why you're getting this issue. 

Before doing so, please check out our support hours to ensure that we address your concerns on time. Here's how to connect with our Customer teams:   

1. Sign in to your QuickBooks Online company.
2. Go to Help (?).
3. Select Contact Us.
4. Enter your concern, then select Let's talk.
5. Choose a way to connect with us. Message an agent or Get a callback. 

Due to the outbreak, we have limited staffing and have reduced our hours to 6:00 A.M. -6:00 P.M. PT Mon-Fri and some products will only have chat support during this situation.  Rest assured, we will resume normal hours as soon as possible.   

Here's a resource related to Managing user that you may find useful: Add, delete, or change user access. 

Please don't hesitate to reach back out to us if there's anything else you need. We're always here to help. Have a good one!