Hello @cg73,

You can let your client use a different browser to login to their account. Below is the list of browsers they can use.

• Google Chrome
• Firefox
• Microsoft Edge
• Google Play
• Safari 11 or newer

Once done, let your client log in again. Please refer to this article for more information: System requirements for QuickBooks Online.

I'm also sharing with you our page about QuickBooks Online help articles for more tips and recommendations.

You can always come back to this thread if you have questions or concerns. The Community is here to help. Thanks for coming in today and have a nice day ahead.