Read on here.
https://learn.microsoft.com/en-us/azure/devops/server/requirements?view=azure-devops-2020
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--