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The future version will have self-test for the site url (patch committed to the repo).
In your case you should go to "settings->URLs" and set the site url. Make sure the base url ends with a slash (this is autocorrected in the new version too). Second part is /admin/sites/<site_id>/
-> domain name (this is fixed too in the new version, that is the site now needs to be entered only in one place).