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I’m trying to set up RSAT (Regression Suite Automation Tool) to run existing test cases from Azure DevOps Test Plans against a Dynamics 365 Finance & Operations environment (cloud sandbox). The ADO connection works (PAT + test plan connection successful), but the browser automation cannot start the client session.
RSAT installed on local Windows machine
Microsoft Edge + Edge WebDriver (msedgedriver) is being launched by RSAT
D365FO environment: LEARN sandbox (host in EU region)
Azure DevOps: Test Plan + duplicated Test Suite (safe copy)
Authentication: Entra ID (App registration + certificate)
In RSAT settings:
Hostname: cont-learn.sandbox.operations.eu.dynamics.com
SOAP Hostname: cont-learnaossoap.sandbox.operations.eu.dynamics.com
(I have also tried with/without https:// in both fields)
User/Admin:
user@company.com and username (both exist in the environment)Certificate/App registration:
Certificate exported from LCS “Connect” for the environment (got .crt + .pfx + password)
Installed certificate locally under Current User > Personal > Certificates
Added the certificate thumbprint to the Entra ID app registration under Certificates & secrets
App registration is used for RSAT authentication (client id available, can share if needed, but prefer not to post publicly)
Open RSAT
Validate Azure DevOps connection → Successful
Select Test Plan → Successful
Configure Hostname + SOAP Hostname + Admin user
Click “Test connection” (or start running a test)
RSAT should open Edge, authenticate, and load D365FO so it can attach to the client and execute UI automation.
RSAT shows error:
Edge opens briefly, but loads a failing page:
“This page isn’t working … can’t currently handle this request”
URL looks like:
https://cont-learn.sandbox.operations.eu.dynamics.com/TestPage.htm?serviceName=Service<GUID>
If I open this manually:
https://cont-learn.sandbox.operations.eu.dynamics.com/TestPage.htmStarting msedgedriver 144.0.3719.115 (...) on port 63005
Only local connections are allowed.
msedgedriver was started successfully on port 63005.
DevTools listening on ws://127.0.0.1:63008/devtools/browser/<GUID>
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