Create New Test Plan button missing from Test Plans for all users on all projects

Question

Create New Test Plan button missing from Test Plans for all users on all projects See below

Answer 1

Create New Test Plan button missing from Test Plans for all users on all projects

Generally Test plan creation is limited to users subscribed to Test Manager extension or VS/MSDN subscribers.

Basic license users can only run tests. You need a valid Visual Studio subscription (Enterprise, Test Professional or MSDN Platforms) or Test Manager license ($52 monthly): https://marketplace.visualstudio.com/items?itemName=ms.vss-testmanager-web to create test plans.

See this thread : Can't add a new test plan

So please check if you have the license to create the test plan, and for an paid extension you must assign that extension to users who need access, so they can start using that extension's capabilities. Please see Assign paid extension access to users

And check if Basic + Test Plans as free trial is expired.

Please check this thread for some more details How do I grant permissions to manage test plans in Azure dev-ops.