Hello, @StephMPC.

It's my pleasure to help you figure this out. Thus, you can use the link seamlessly in QuickBooks Desktop (QBDT). 

Here are some things you can check to ensure the link is accessible. 

A. QBDT is in the latest release. Simply press F2 to see the version you've currently used. See the sample screenshot below for your reference. 

If it's not updated, here's how to update it: 

1. Go to the Help menu and select Update QuickBooks Desktop.
2. Click the Update Now button. 
3. Tap Get Updates to start the download. 
4. Restart the computer and install the latest version. 

You may refer to this article: Update QuickBooks Desktop to the latest release.

    B. The QB Payments is successfully set up. To review the settings, please go to the Edit menu then choose References, and click Company Preferences under Payments.

Once confirmed and the issue persists, I'd recommend doing the following troubleshooting steps to get rid of the problem. 

• Run the Verify and Rebuild tool. This tool scans your company file for issues and fixes them right away. You can follow the steps outlined by Rose-A above. 
• Use QuickBooks File Doctor to fix some company issues like link unavailable. 
• Verify damage transaction link. 

If the issue keeps going, I'd advise you to reach out to our Technical Support. They have tools capable of pulling up your account in a secure environment and send a ticket to our engineers for review.

 Here's how: 

1. Go to this QBDT help link. 
2. Select your product and click Continue. 
3. Enter your concern in the box and tap Continue. 
4. Choose either Chat with us or Have us call you.  
5. Follow the on-screen instructions.

Please check our support hours to know their availability.

You may also check out this article on how to fix some data damage errors you might encounter in QBDT: Top data damage errors in QuickBooks Desktop.

Let me know how the call goes and if you have follow-up questions. I'm glad to help. Keep safe.