Either (1) You didn't install the latest product updates or (2) there's a 3rd party app interfering. 

Verify all Sage Modules and third party products are upgraded to Sage 2023. 

We're on Sage 2023 build 0. I'll contact our vendor to update to 2023.3 which I see is available. Hopefully this corrects the issue.

Appreciate the suggestions, I'll take others if anyone has additional thoughts.

The Product Update is not the problem. Check to see if any modules are still Sage 2017. 

Again, apologies since I'm a little new at Sage. Would that be found in System Information?

Here:

There are several applications (OW, NP, and NT) that are 2017, but in this case, the AR and AP applications as well as most of the rest are 2023.

Verify ARTV - Sage Sales Tax by Avalara. Don't know what the latest version would be, but that would impact invoice entry.

(1).  You didn't install the latest product updates.  You should be on build 10 PU1.

Gotcha... Our vendor is currently out of the office. We're hoping to complete our updates to PU3. Side question, do you know if/where its possible to download the patch/build updates without waiting for our reseller? We also have some lanpak licensing errors that seem to be a part of a fix in update 3. Appreciate all the input.

All downloads come from your Sage login, you should see a "My Downloads" somewhere.