In https://www.drupal.org/project/okta_api/issues/3398833 🐛 GuzzleHTTP constraint doesn't allow upgrade from Drupal 9 to 10. Fixed , the "dakkusingh/oktasdk" dependency was changed to use an updated fork. This resulted in a patch that this module includes, "Add a group option to the user creation #3", failing to apply. As it turns out, the patch was actually incorporated in the "dakkusingh/oktasdk" fork that is now being used, and so the patch is no longer necessary.
Remove the patch section from this module's composer.json. Since it is a composer.json change, a regular patch won't have an effect on this issue. I will follow up with a merge request shortly.
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I can confirm the removal of this patch does work, as OP noted it's no longer required given use of the forked repository.