Client deactivated her account, when trying to activate via payment : Unable to process your request at this time. . (Error code: -81594, type: INVALID_REQUEST)

Hello there jakusv,

QuickBooks Online and its associated add-ons make running your business and doing your books a more streamlined and simplified process. I love that your client is looking to resubscribe after having cancelled previously! Please extend my welcome back to the QuickBooks family. Errors like the one you've described can make it difficult to resubscribe, which takes time away from other important tasks that you both have to work on. Let me give you a hand with this so your client can get back up and running with QBO.

The first steps to take are some browser and internet troubleshooting. Sometimes the images and files that are stored in your browser's cache can impact the way that QuickBooks runs, and completing the steps below helps us to determine if that's the root of the problem. Once you or your client have tried these steps, please have your client attempt to subscribe again.

• Clear your browser cache if you're using a browser
• Clear the app cache if you're using the QuickBooks Online app for Windows or Mac
• Try a browser if you're using the app
• Try a private browser window
• Try another browser type
• Make sure you're using a supported browser and system
• Reset your Internet or try on another computer or device

If these steps don't quite do the trick, the next important step will be to reach out to our team of support experts outside of the Community. They are equipped with the tools to collect your sensitive account details and troubleshoot this with you in real-time via screen share. If they can't get to the bottom of the issue, they'll make sure that it's properly escalated to our team of engineers for a fix. They'll also ensure that your name and contact details are added to the list of impacted users so that you'll be among the first to know when the problem's resolved. Here are some of the ways you can reach out when you have the chance:

Phone: Call us at 1-855-253-1536 from Monday to Friday between the hours of 9 AM and 8 PM EST.
Schedule a Callback or start a Chat: click (?)Help in the upper right > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat. 
Social Media: Facebook, Twitter, and Instagram.

If you have other questions or need further support, please let me know. I'm happy to assist you where possible. Have a good day!