Stamps.com no longer working QB desktop?

Thanks for reaching out to the Community, Fedup2022. I appreciate your detailed information and screenshot.

Since you're encountering an error returned from Stamps.com in the QuickBooks Shipping Manager for Stamps.com window, I'd initially recommend troubleshooting your built-in internal browser if you're using 2020, 2021, or 2022.

Here's how:
 

1. Confirm your books are up-to-date with their latest release.
2. Verify the computer you're using QuickBooks with has Internet Explorer. While this browser may not be used for some online services, it's still required for QuickBooks to function properly.

In the event you're using QuickBooks 2019 or an older version, you can consider purchasing a subscription to QuickBooks Online or QuickBooks Desktop to receive the latest version which includes recent critical updates. If you've already purchased a QuickBooks Desktop subscription, you can upgrade to the latest version.

You can also troubleshoot with your QuickBooks Tool Hub. Tools like Quick Fix my File or QuickBooks File Doctor are able to repair internal data issues. I'd additionally recommend confirming your computer meets each of the program's system requirements.

If the message continues displaying after each troubleshooting process, you'll want to continue getting in touch with our Customer Care team through chat/phone. They'll be able to pull up your account in a secure environment, conduct further research with you, and create an investigation ticket if necessary.

Please don't hesitate to send a reply if there's any questions. Have a great Wednesday!

@Fedup2022 

What QB Desktop year version are you using?

No change.

2020 on Win 8.1

I know it's old but it does what I need it to do - invoices, keeps a history of orders and bills paid and (used to) ship orders. It has worked flawlessly until it didn't.

FYI the Intuit solution is (of course) switch to cloud QB, upgrade my hardware to run the newest QB, etc.  No help  whatsoever.

I'm pretty sure I found another system that does what I need without the up-sell. 

Install the trial version of QB Desktop 2024 Enterprise to isolate the problem. If it works, you can use it for good as a workaround.

QB2024 is 64 bit only (per Intuit) so I would need to invest in new version of Windoze. Not worth it for one program.