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Merging realtime data from two separate license servers under a single server is supported only in case of merging realtime license servers with their duplicates created during upgrade to v4.6. This is possible when, apart from the conditions 1-4 listed in Merging license server data, duplicated one of the realtime license server servers you want to merge with the other realtime server has specified configuration is configured in the Realtime License Server tab in the Administration page.
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