Starting with TFS 2020 Microsoft is changing the API structure that they have traditionally supported with TFS.
Microsoft is removing the SOAP APIs which have been in use by all desktop clients such as TMO and Visual Studio. These APIs are used to interact with TFS and do work item tracking and management.
As a result these thick clients will not work out of the box with TFS 2020. While Microsoft is making available REST APIs, we are awaiting their direction for thick clients to integrate with TFS 2020. Until we have concrete understanding of this, we are unable to comment on TMO’s compatibility with TFS 2020.
Microsoft plans to roll out same changes to Azure DevOPS from 1st January 2020. We are currently working with Microsoft to understand this direction better and modify TMO accordingly to support TFS 2020.
As of today TMO is supported with Azure DevOPS until 31st December 2019 and TFS 2010 upwards except for TFS 2020.
We will update this blog post with more details in near future as we work with Microsoft towards building support for TFS 2020 in TMO.