I appreciate the time and effort you have dedicated to contacting our Live Support, scottpd. Let me route you to the right direction of support channel to investigate this matter.

Upon checking, the investigation about the inability to update recurring invoice reminders after creating it in QuickBooks Online (QBO) with an associated INV-104174 has been closed. If you're still encountering the same issue, I recommend contacting our Customer Support Team. They have tools to conduct a more thorough investigation and determine the cause. It'll also allow them to submit a ticket to our engineering team to alert them about the issue if necessary.

Here's how: 

1. Go to the Help icon.
   
2. Select the Search tab and hit Contact Us.
   
3. Click the Ask about something else tab.
   
4. Key in your concern, or directly input the INV-104174 and hit Continue.
   
5. Choose a way to connect with us:
   
   • Have us call you - Get a call from a support expert.
   • Chat with us - Start a conversation with a support expert.

To make sure you receive timely assistance from our support team, please take a moment to review their operation hours. 

Furthermore, once the investigation is closed, you'll receive an email notification. If you haven't received one, please check your spam and junk folders. Alternatively, you can call us directly and follow the outlined steps above.

Our dedicated customer service team stands ready to assist you every step of the way, scottpd. I understand that dealing with technical challenges can bring up negative feelings, and we are here to offer you the support and guidance you need. If you have more questions about managing your recurring transactions, feel free to ask by commenting below. I'll be here to assist you every step of the way.