Waaa087 Fixed |link| -

: If the error appears while launching games on Windows 10 or 11, users often need to uninstall and reinstall the Gaming Services via PowerShell.

The WAAS087 error is a variation of the common Windows "Error 87: The parameter is incorrect". While standard Error 87 messages can appear during VPN setup or DISM command executions, the "waaa087" variant specifically targets background assessment services and software deployment pipelines. Common symptoms include: Interrupted software installations. "Parameter is incorrect" pop-ups during Windows updates. waaa087 fixed