May I ask for the exact error message that you've encountered when receiving a payment? Also, a screenshot from where you saw it will be helpful. This way, I can make sure that we are on the same page so I can provide an accurate solution to your concern.
In the meantime, let's perform some basic troubleshooting steps to determine if this is a browser-specific issue. Please follow the steps below.
First, access your QuickBooks Online account in a private window. This will allow the program to run without storing cache or cookies. To generate a private window, please follow these keyboard shortcuts:
Google Chrome: press Ctrl + Shift + N
Mozilla Firefox: press Ctrl + Shift + P
Microsoft Edge: press Ctrl + Shift + P
Safari: press Command + Shift + N
Once you're signed in, received a payment again.
If you don't experience the same thing, go back to the regular browser and clear the cache. This will refresh the background process of your browser settings. But, if the same issue happens, use another supported browser.
Also, you can visit our QuickBooks Blog for any updates on what's new in QuickBooks. This page also provides articles under QuickBooks tutorials, Accountant Advice, Developer Community, etc.
Please let me know how it goes by posting a comment below. I'm always around to help. Stay safe and take care always.