UseTFS addon license count needs to match with your current JIRA Server license count. For example, if you have a JIRA Server licensed to 50 users, you'll need to purchase UseTFS addon for 50 users as well, otherwise it won't work due to license count mismatch.
For more information you may refer this page: https://www.atlassian.com/licensing/marketplace#licensingandpricing-1
Hope it helps!
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