@Rusimyhr 

RE: This is not the kind of service we want you to experience, @water89 and @Hazel2019. Let me chime in so you can use the Estimates seamlessly in QuickBooks Online.

Our system engineers have discovered that the issue is related to having Plain text selected under Online delivery in your Sales settings. I'll provide the steps on how to change it.

Well actually it sort of is, because it is what Intuit shipped without testing properly. And then also failed to figure out for a year and a half.