Hi Eben,
This is the exact error I am receiving:
Error
The site template requires that the Feature {e8389ec7-70fd-4179-a1c4-6fcb4342d7a0} be installed in the farm or site collection.
Correlation ID: {86196933-852a-432b-ba35-ea3ff5a27d9b}
The steps I took were:
1. Save Site as template (Sharepoint 2010 Foundation On-Premise)
2. Loaded .wsp fill to Solutions on Sharepoint Online
3. Activated Solution
4. Tried to create a new site from the templates (I can see the solution listed)
5. I then get the error above.
Thanks for your support