"Add Code Repository" not working for personal GitHub account

[BenJetson]

I originally posted about this issue on the Atlassian Community, but unfortunately nobody there had a solution to this problem.

I am trying to use Jira to plan out pieces of a major rewrite of my own personal website. I installed the GitHub integration and authorized it to access all repositories on my account. 

On the GitHub for Jira page under Manage Apps, I see my personal account listed under Organizations, with the correct number of repositories and a finished backfill status.

However, when I try to link the repository to a project under Project Settings > Toolchain, I receive an error:

Unable to retrieve content. Check that your tools are configured and you have the right access.

I have tried removing the GitHub for Jira add-on from my site and adding it again, but this produces the same result. Does anyone have any insight on how to solve this? I have read a couple of other forum posts about it, but haven't seen anyone follow up with a successful report back. However, there is no documentation that indicates this is not supported, which gives me hope that Atlassian thought about this use-case for small developers using Jira.

I checked again in case it was still synchronizing or something. The same results a few days later.