Hello @ltroya-as Luis 
Welcome to DevKinsta community!
Currently only the standard WordPress install/structure is supported by DevKinsta, and the implementation of Bedrock/Trellis is not supported by default with DevKinsta . So yeah, you’re correct that it’s because DevKinsta couldn’t find that wp-config.php file (due to the structure of Bedrock).
These have been discussed in the other threads as well (related to Bedrock) that you may want to check such as: here , here and here .
You might also require to edit the NGINX config to make it work (to change the document root folder), but again we won’t be able to provide support for these bedrock settings in DevKinsta. With DevKinsta 2.10.0 version, there’s a new feature which allows users to edit their site-level NGINX configuration file.
Cheers,
Agus