You might encounter a problem when creating a search center:
Site creation request for Search (search): Search(search) creation has failed. Internal Server Error. Provisioning did not succeed. Details: Failed to initialize some site properties for Web at Url: 'https://mycompany.sharepoint.com/sites/dev/search' OriginalException: The value of AvailablePageLayouts contains invalid url. All page layout urls inside the string have to be server relative. The url '~SiteCollection/_catalogs/masterpage/SearchResults.aspx' ('/sites/dev/_catalogs/masterpage/SearchResults.aspx')is not in the current site collection '/sites/dev'..:
Activate the "Search Server Web Parts and Templates" and "SharePoint Server Enterprise Site Collection features" Site Collection features, and try again.