Hello CallofAeons,
Unfortunately, the ‘repair’ functionality did not solve the issue.
I was told by Epic Player Support to contact Unreal support because there was nothing further they could do:
"If the error continues, I will need to redirect you to a support team who will likely be able to help more efficiently than I can, as we at Epic Games Player Support only support Epic’s own games or technical issues with the store.
In that case, I kindly ask you to reach out to the Unreal Engine support through here:
Thank you for your patience, and I wish you good luck! If you need help with any other question or doubt, don’t hesitate to let us know!"