I got the Bitbucket server configured over the personal Ubuntu server via Docker.
In the beginning, I am prompted to enter the license key, which I don't have. But when I go to the Atlassian account and try to generate one I got redirected all the time.
On the evaluation page (https://my.atlassian.com/license/evaluation), when I select the server type (Cloud or DC) I got redirected to the workplace page. Same with the "Generate License" button.
As a result no license generated and no errors shown.