Generated Voices Sharing Update
It is no longer possible to share generative voices (created in Voice Design) to the Voice Library. Voices that have already been shared to the Voice Library will remain for now. You can still share generated voices, just not add them to the Voice Library.
Update: As of October 2024 it is additionally no longer possible to enable sharing of voice designed voices, even if not adding to the library. Sharing remains active for generated voices that were previously shared.