I Ian, I wan just to let you know that we had updated the documentation, please have a look: https://www.gooddata.com/docs/cloud/api-and-sdk/api/api_reference_all/?apiPath=api-reference%2Fanalytics-model For your convenience:

Note: If the invitation is not accepted within 21 days, it expires automatically. After this period, the pending user is removed from the organization. This behavior is expected and ensures that inactive or unconfirmed accounts do not remain in a pending state indefinitely. If needed, you can invite the user again by creating a new invitation.

Thank you for bringing this to our attention. Have a nice weekend ahead 🙂