Hello @Jim Cheyne
Thank you for reaching out on the community and telling us about your issue. I do apologize in the issue you're having. That is odd I'm wondering where exactly the issue is. To start off here is this the only biller that you're experiencing issues with when you send a bill? You're using direct connect bill pay so there's not much we can check on our end but is this the first time you've had issue with this specific biller? I would double check the online payees to see if it's listed properly inside of Quicken. You can do so by going across the top to tools > online payee list.
Once you've had a chance to double check let us know if you're able to find anything. Also if you have an additional details about when this has happened with any other billers/times let us know as well.
Thanks,
Quicken Francisco