The SSMS Add-on entry in Remote Desktop Manager uses command-line arguments to launch SSMS and pre-fill the authentication details, including the username and password. However, Microsoft removed support for password injection via command-line arguments in SSMS 18 as part of their security enhancements.
For users who rely on credential injection in Remote Desktop Manager, this change introduces an extra step when launching SSMS connections. If you are using SSMS version 17 or earlier, password injection will still work as expected. However, once you upgrade to SSMS 18 or higher, you must manually enter your password.
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