https://support.atlassian.com/bitbucket-cloud/docs/understand-bitbucket-issues/
writes that
Bitbucket issue tracker is not available in all workspaces
"Issue Tracker is not supported in workspaces administered through admin.atlassian.com. The Issue Tracker and issues will be disabled when you create or following a transfer to a workspace administered through admin.atlassian.com. If you have already transferred the repository, you can transfer it back to the original workspace to regain access to the issues. Issues can be exported as a zip file or migrated to Jira."
How can I transfer a repository "back" so that I would have a Bitbucket issue tracker?