Hi @Anne Sofie271832645ll1,
From the Adobe ID that you are using here on the forum I can see that you are a member of an enterprise organization. You'll want to make sure that when you are signed into the Adobe Stock website that you are using the organization's profile and not your personal profile. Sign out of the Adobe Stock website and clear your browser history. Return to the site and sign in. When prompted choose Company, not Personal, in the sign in screens. After signing in confirm that you see your organization's name under the profile menu on the Stock site.
If your organization is set up with Adobe Stock you should be able to see your previews without the watermark. If this is not the case please raise the issue with your account administrator who can reach out to the team that set up Stock for your organization and help troubleshoot.