Hello together,
are there any news about this issue? I have here the same issue on Windows 10 Pro (Version: 1809 / OS build: 17763.1397), and with my user I don't have access to PowerShell.

I have received the following message from the SFDX CLI command, that might help?

ERROR running auth:web:login: spawn UNKNOWN
*** Internal Diagnostic ***

Error: spawn UNKNOWN
at ChildProcess.spawn (internal/child_process.js:403:11)
at Object.spawn (child_process.js:553:9)
at module.exports (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\open\index.js:175:34)
at async Login.executeLoginFlow (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\plugin-auth\lib\commands\auth\web\login.js:54:9)
at async Login.run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\plugin-auth\lib\commands\auth\web\login.js:35:30)
at async Login._run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\command\lib\sfdxCommand.js:81:40)
at async Config.runCommand (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\config\lib\config.js:173:24)
at async Main.run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\command\lib\main.js:27:9)
at async Main._run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\command\lib\command.js:43:20)
at async Object.run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\dist\cli.js:114:21)
Outer stack:
at Function.wrap (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\core\lib\sfdxError.js:171:27)
at Login.catch (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\command\lib\sfdxCommand.js:248:67)
at async Login._run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@salesforce\command\lib\sfdxCommand.js:85:13)
at async Config.runCommand (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\config\lib\config.js:173:24)
at async Main.run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\command\lib\main.js:27:9)
at async Main._run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\node_modules\@oclif\command\lib\command.js:43:20)
at async Object.run (C:\Users\xxx\AppData\Roaming\npm\node_modules\sfdx-cli\dist\cli.js:114:21)
******

 sfdx:Login ERROR [
sfdx:Login '\x1B[1mERROR running auth:web:login: \x1B[22m',
sfdx:Login '\x1B[31mspawn UNKNOWN\x1B[39m',
sfdx:Login '\x1B[31m\x1B[39m\n' +
sfdx:Login '\x1B[31m*** Internal Diagnostic ***\x1B[39m\n' +
sfdx:Login '\x1B[31m\x1B[39m\n' +
sfdx:Login '\x1B[31mError: spawn UNKNOWN\x1B[39m\n' +
sfdx:Login '\x1B[31m at ChildProcess.spawn (internal/child_process.js:403:11)\x1B[39m\n' +
sfdx:Login '\x1B[31m at Object.spawn (child_process.js:553:9)\x1B[39m\n' +
sfdx:Login '\x1B[31m at module.exports (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\open\\index.js:175:34)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Login.executeLoginFlow (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\plugin-auth\\lib\\commands\\auth\\web\\login.js:54:9)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Login.run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\plugin-auth\\lib\\commands\\auth\\web\\login.js:35:30)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Login._run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\command\\lib\\sfdxCommand.js:81:40)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Config.runCommand (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\config\\lib\\config.js:173:24)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Main.run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\command\\lib\\main.js:27:9)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Main._run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\command\\lib\\command.js:43:20)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Object.run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\dist\\cli.js:114:21)\x1B[39m\n' +
sfdx:Login '\x1B[31mOuter stack:\x1B[39m\n' +
sfdx:Login '\x1B[31m at Function.wrap (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\core\\lib\\sfdxError.js:171:27)\x1B[39m\n' +
sfdx:Login '\x1B[31m at Login.catch (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\command\\lib\\sfdxCommand.js:248:67)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Login._run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@salesforce\\command\\lib\\sfdxCommand.js:85:13)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Config.runCommand (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\config\\lib\\config.js:173:24)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Main.run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\command\\lib\\main.js:27:9)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Main._run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\node_modules\\@oclif\\command\\lib\\command.js:43:20)\x1B[39m\n' +
sfdx:Login '\x1B[31m at async Object.run (C:\\Users\\xxx\\AppData\\Roaming\\npm\\node_modules\\sfdx-cli\\dist\\cli.js:114:21)\x1B[39m\n' +
sfdx:Login '\x1B[31m******\x1B[39m\n' +
sfdx:Login '\x1B[31m\x1B[39m'
sfdx:Login ] +167ms
@oclif/config start postrun hook +212ms
@oclif/config postrun hook done +24ms

I know, that it's an issue within sfdx-cli, but as @WillieRuemmele already said, it seems to be related here.

Thank you :)

PS: I have also created an issue for the SFDX developers.

Uh oh!

Windows Command Prompt support broken #205

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