After editing an account to turn off online access, the Online Services tab is still available or the lightning bolt continues to appear in the Chart of Accounts column.
Intuit recommends more than one solution for this problem. The first solution may solve your problem, or you may need to try all of them to resolve the issue. For best results, perform the solutions in the order shown.
Use Basic data damage troubleshooting.
Note: If you're unable to save the file as an IIF, place the complete file name and extension in quotes: "COA.iif", then Save.