Scenario:
There was a need to install the QuickBooks integration manager again and then connect it to QuickBooks so that the data from the Web Timesheet could be transferred to QuickBooks. However after installing the QuickBook Integration Manager and providing the Web Timesheet URL, there is an error that says 'QuickBook Administrator should grant the access to contact the company file'.

Resolution:
The user who is logged in to QuickBooks must be the administrator on QuickBooks. When QuickBooks is launched, the login credentials provided must have administrative rights on QuickBooks.