Hi there, @DD Bookkeeping.
Currently, we have an ongoing investigation into the reason behind the error message you're getting. Rest assured that our engineers are doing their best to fix it as soon as possible.
I recommend contacting our Customer Care Support team so you'll be added to the list of affected users. This way, you'll receive email updates on the investigation's status and be notified once it's been resolved. I've included the steps to contact support below.
- Click the (?) Help icon in the upper right-hand corner of the dashboard.
- Select Talk to a Human.
- Enter a short description of your concern and press Enter.
- Click I still need a human.
- Select Contact Us to connect with our live support.
- Choose Get a Callback.

In the meantime, you can exclude the transaction and enter the refund manually.
I appreciate your patience as we work through this. If you have any other concerns, please don't hesitate to drop a comment below. Take care!
FYI, I found a good solution, for now, is to manually add the transaction into the credit card register and then the downloaded transaction will switch from an "add" to "match" status. At least for me, the match action works correctly