Emailed invoices not showing viewed on any account in invoice activity (they have been Viewed} My other account does show viewed.

Let's perform some troubleshooting steps to get your Invoice status to show as Viewed in QuickBooks Online (QBO), looker392003.

We can log in to your account using an incognito browser. Private browser prevents saving cache and cookies that sometimes cause errors when running frequently visited websites. Here are the useful shortcut keys you can use to access one:

• Ctrl+ Shift + N for Google Chrome
• Ctrl + Shift + P for Mozilla Firefox and Microsoft Edge
• Command + Shift + N for Safari

Once done, verify the invoices' statuses to see the viewed status by following these steps:

1.  Tap on Sales on the left pane.
2. Select Invoices.
3. Click on the transaction to see its status.
4. Repeat the same steps for other entries. 

If it works, return to your default browser and clear its cache. Every so often the cache becomes overwhelmed with older data which can potentially cause viewing and performance issues. Clearing it will refresh the system, and you'll be able to work with a clean slate. Switching to another compatible one to help rectify the issue.

You can also check a browser's compatibility with QuickBooks by utilizing our browser health checkup tool. QuickBooks supports the current and two previous versions of browsers. If you find that you're using an unsupported version, make sure to update it to its latest release. Steps for doing so can be found on the particular company's website.

I'm adding this material to provide extra hints about invoices QuickBooks Online (QBO): Create invoices in QuickBooks Online.

Once your customers view and pay their invoices, track the payments immediately. Use the resources from this article as your reference: Record invoice payments in QuickBooks Online.

Feel free to let me know in the comment section below if you have any follow-up concerns about the status of your invoices. I'm just a click away to help you again. Stay safe!