I hear you, and I understand the frustration that inconsistencies like this can cause, @MirelesJ.

There's currently a new investigation (INV-97919) about undelivered invoices. Rest assured that our product engineers are working on a fix. To be notified once the issue is resolved, I encourage contacting our Support team to add you to the list of affected users. Here's how:

1. In your QuickBooks Online (QBO) company, go to Help (?).

2. Select either of these tabs:

• Assistant tab and type Talk to a human.
• Search tab and click on Contact us to connect with a support expert.

3. Choose how you want to reach us (phone or chat).

If you have other concerns about managing invoices in QBO, let me add this link as an additional resource: Manage invoices.

Let us know if you have further updates about undelivered invoices in QBO. We'll do our best to assist. Take care.