We are currently in the process of switching providers for our shipping functionality, @TheSound. I'll explain more information below.
 

The reason why you are seeing this error because UPS no longer supports the Shipping Manager software currently in QuickBooks. As a result of this switch, we will have a new system for managing shipping, called the Shipping Manager, which will be available starting in May. If you have not set up shipping with your carrier yet, you will not be able to do so until the new system is launched in May. You might also start seeing pop-up messages in QuickBooks about this upcoming change.
 

For more details about the new and improved shipping experience in QuickBooks Desktop, refer to this article: Get ready for a new shipping experience in QuickBooks Desktop.
 

For now, if you need to generate shipping labels, we recommend doing so directly through the UPS website.

Additionally, consider updating your QuickBooks Desktop to the most recent version in order to access the latest features and product enhancements.

Let me know in this thread if you have any questions about the shipping manager in QuickBooks Desktop. I am here to provide assistance and address your concerns effectively.