Could mean you run multiple databases on your instance. If so, since most external systems require to have a clearly specified entry point to communicate with your instance, set the database filter parameter in your odoo.conf to prevent uncertainty about what database is to be used. See also https://www.odoo.com/documentation/18.0/administration/on_premise/deploy.html#dbfilter

Also, check whether you can see these connections attempts in your log files. This could provide some further insights.

Else, not much can be said and you should rather refer to the Patchworks support department (probably via https://www.wearepatchworks.com/collections/odoo-integrations#)