Ah you are updating a "text field with formatting" in WF, I missed that
part, we haven't started using those fields but i'm guessing its similar
issues to the typeahead field issue I ran into last year in Fusion, they
cannot be updated in the same way as a simple text field. If its working
when there is no special characters but failing when there is, they
probably just need to be escaped. Are you using the "Create JSON" module
before sending it via the custom API card, have you an example of a
...