Hi. I’m able able to view any of the lists I’ve created in HubSpot, withing the Divi Opt-in module. The lists are passive and have both “Forms” or “Subscriptions” as filters. I am not getting error when I entering my account and API (Private App) key. Additional info is that the Hubspot plugin is installed and connected and the Non-Hubspot Form integration in turned ON.
Below are the images of the Integration API, Divi Module and Lists
Hi, @RobStuart 
I’d suggest taking this to the Divi support team. To confirm, the Divi theme and builder have updated to use Private Apps. I found several posts with the same issue, and all were referred back to Divi for support. Here’s a recent one — Private App: Email List access token not working on Divi
Best,
Jaycee
Hi Jaycee. Thank you I’m trying both DIVI and Huspot communities for the solution. Let’s see if I can solve this. 
Hey Im having the exact problem, did you find any solution? thanks!
I have the exact same problem.
I’m having the same issue. Has anyone solved this problem? Thanks in advance
Hi @Craig-Eddington,
Thank you for posting to the Community!
I would recommend to check out Jaycee’s comment where they suggested taking this to the Divi support team.
They stated the following: “To confirm, the Divi theme and builder have updated to use Private Apps. I found several posts with the same issue, and all were referred back to Divi for support.
Here’s a recent one — Private App: Email List access token not working on Divi”
I hope this helps!
Cassie, Community Manager
Thanks. yes it does. Contacting divi support now 
