Can't connect Zoho Writer to WordPress

I'm trying to use the Post to Blog feature of Zoho Writer, but whenever I try to add my WordPress site (self-hosted, with Jetpack installed and set up correctly), enter my credentials, and log in at

https://staging.tidbits.com/wp/wp-login.php?action=jetpack_json_api_authorization&redirect_to=.....

I get my site's error page, with a URL that looks like this:

https://staging.tidbits.com/wp-admin/?jetpack-code=oSEqMOgIfcVEsOZzVhFN1EdRHpzH7cka&jetpack-user-id=754&jetpack-state=5f4ca27421

The problem, I believe, is that my site is in the /wp directory so the second URL isn't going to the right spot.

Is this a problem with Zoho Writer that could be fixed easily, by acknowledging that many sites are in a subdirectory?

cheers... -Adam