For Studio One Users requesting an activation reset request, you can manage your own activations in your https://my.presonus.com account by clicking on the "My Products" link once logged into your account. Then choosing the "My Software" link. Then click the link to "View All Details" for your registered software you wish to change the activations for.
Please visit this page for the most current Manage Activation steps: https://support.presonus.com/hc/en-us/articles/360044791992-Studio-One-5-Manage-Activation-Reset-Activation-Remove-Activation