If QuickBooks is not accepting the application security credentials being passed.
This could happen in following cases
- The QuickBooks instance is not a paid instance - credentials for trial or developer instances will be rejected.
- The user attempting to grant permission for the connection is not the Master Administrator, Company Administrator, or Accountant user.
- The QuickBooks instance country is not US or Canada.
If none of the cases above apply to you then let us know and we will investigate further.