Hi there, @dogwoodlandscapi.
Let me share some troubleshooting steps to get to the bottom of these missing clients and test emails. Here are some possible reasons why you don't receive them:
To start, check your Spam or Junk Mail folders to verify if the emails were moved there. If you don't see it, try clearing and re-entering your email address in the settings to refresh the system.
Once done, send yourself a test invoice to check if it works. If the email still doesn't appear, there may be some security settings that need to be set in your email server. I suggest you verify with your service provider to evaluate your options or use a different email address that has a different domain.
For additional reference, I've attached some articles you can use to make sure you receive important messages from Intuit, as well as how to let your customers pay their invoices online:
Please know that I'm just a post away if you have any other questions.