Hello Thad,
Thanks for sharing this issue.
It may happen because you're trying to merge two Lexemes having different lexical categories (verb and noun).
Could you add the content of the response body (“response” tab in the dev tools view) so we can learn more about the error?

FYI, you can see the details of the merge features for Lexemes in this ticket.

On Mon, 27 Apr 2020 at 09:47, Thad Guidry <thadguidry@gmail.com> wrote:
The only clue that I get that there is a problem is that the mediawiki-api-error field says "failed-modify" ?

Here's my Request URL shown in the GET just before the POST :

and here's the screenshot of the Response:


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