Final Update: Thursday, February 22 2018 15:40 UTC
We have worked with our partners in Azure to resolve this issue in this region. East US region is now available as an option for users to execute Load tests.
Initial Update: Wednesday, February 21, 2018 14:49 UTC
This is to make you aware that we have removed East US as an option for the regions to execute Load tests. Users are advised to follow the workaround mentioned below.
Workaround : We recommend Load Test users to choose a location other than 'East US' when triggering a load run. See 'Run and Analyze your load test' section in this document for instructions on how to choose a location.
Customers can also use their own agents (documentation here) to perform load generation in this region.