Hmmmm, maybe I phrased my question wrong, but thanks for the reply! I'm not actually using any code (besides PowerQuery and DAX)
When I said connecting to the APIs, I meant that within Power BI I'm using "Get Data", then using the Web data connector to tap into those web REST APIs for our internally hosted servers (CommVault, VMWare, Isilon, XtremIO, etc.)
Is there a way I can tell Power BI to trust specific internal servers, or disable the cert checks? Probably a terrible idea, but trying to get this POC up and running at least. If there's a safer solution, that's great as well - but I'm still learning about certs, and from what I've been told, getting those onto our internal servers is going to be a big problem.