QB Issue Resolution:
Hope you’re doing good. 🙂
I would like you to reboot all computers first and open again QuickBooks and file on both computers. Then you can switch again to single user mode, see if it will have the same message.
Resolution for Issue 'When I try to switch to single user mode, QB states that my co worker is still in company file. But she is not, & her name is not listed in QB messenger. How do I fix?' available: Yes (Solved).
Source: Intuit Community forum.
When I try to switch to single user mode, QB states that my co worker is still in company file. But she is not, & her name is not listed in QB messenger. How do I fix?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for Quickbooks/QBO
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