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Hello
our whole team can't connect TFS Azure DevOps today using Visual Studio 2013.
Visual Studio 2022 and Visual Studio 2019 are working fine. The message that returns to VS 2013 is:
"The online service is not available. Please try again later."
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Answer to all your question is here --
Please go through complete article don;t miss any single line.. specially 2-3 paragrapg from the bottom
The product group for Azure DevOps / TFS actively monitors questions over at
https://developercommunity.visualstudio.com/report?space=21&entry=problem
https://developercommunity.visualstudio.com/report?space=22&entry=problem
--please don't forget to upvote and Accept as answer if the reply is helpful--