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My company is in the midst of a brand transition and is experiencing some difficulties in migrating web content to a parent company domain. When content from the old domain was migrated to the parent, there were rel-canonicals set on top level pages of the old domain referencing its equal on the parent destination. Then each sub-page was redirected to the parent company. What I have found is that the only pages that indexed on the partent domain were the top level pages. I am having a hard time figuring out why the sub-pages won't index. Does anyone have advice on how to handle this? Would reactivating the old URLs and setting rel-canonicals help? Also when should 301 redirects be implemented?