QB Issue Resolution:

trying the troubleshooting steps in the article and I appreciate you letting me know which department you had contacted. I want to reassure you that US support is the one you need in this case. Community, US QuickBooks social media pages, or their phone support team are great places to continue to reach out. The Contact Us page outlines the ways you can get in touch.

Resolution for Issue 'How can we fix error code TD500 ‘There was a problem with your update’. QBs no longer takes us to the CardConnect online payment portal.' available: Yes (Solved).
Source: Intuit Community forum.

How can we fix error code TD500 ‘There was a problem with your update’. QBs no longer takes us to the CardConnect online payment portal.: 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 CardConnect
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for CardConnect [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: