Common Party Accounting Error Linking

Hi, I’m trying to use the Common Party Accounting feature- I have it enabled in Accounts Settings. I am trying to link an existing Supplier with an exiting Customer. I’ve tried it with two different entities and get the following error:

Linking Failed: Name cannot contain special characters like ‘<’, '>'Linking to Customer Failed. Please try again.

There are no special characters in the names of these customers or suppliers. Just letters and spaces. Where could the app be finding special characters from?

I have also tried to create the links manually from “Add Party Link” from the Party Link list, with the same results.