Team foundation server is not really considered to be a DevOps tool. Mainly because it is a Microsoft product (not open source). The main requirement to qualify as a DevOps tool is being open source. But do note, it's not a hard and soft rule for a tool to be open source. Its the license and ease of use which really matters.
However, you can use it in your DevOps lifecycle because it provides similar functionality today
Transform your career and elevate your expertise with our DevOps Course!