QB Issue Resolution:

Log into the MSC in-product with QBO
Answer ID: 5908

Select the company name towards the top right-hand side of the home page.
In the drop-down menu, select Company Settings located in the Settings section.
Select QuickBooks Payments from the column on the left-hand side, after which a drop-down menu appears.
Select Merchant Service Center from the drop-down menu.
Select Merchant Service Center from the description on the right-hand side and the Merchant Service Center automatically opens in a new tab or window.
Note: Please make sure your are the QuickBooks Online Master Admin, or a current user of the Merchant Service Center.

Details
Answer ID 5908
Products QuickBooks Online Simple Start (H)
QuickBooks Online Essentials (H)
QuickBooks Online Plus (H)
Categories Merchant Account Service
Date Created 08/09/2013 01:25 PM
Date Updated 11/13/2013 11:11 AM
Allow Crawling? Yes

Resolution for Issue 'Log into the MSC in-product with QBO' available: Yes (Solved).
Source: Intuit Community forum.

Log into the MSC in-product with QBO: 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.

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