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Can't open device "\\.\COM4": Access is denied error when uploading a sketch from Arduino IDE | I learned it. I share it.
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KB4185: "Access is Denied." When Using a Local Account to Add a Windows Machine to Veeam Backup & Replication
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Cannot open serial port connection. Reason: 'Access to the path 'COM2' is denied.' – BarTender Support Portal
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ESP32 & could not open port 'COM5': PermissionError(13, 'Access is denied.', None, 5) - espressif32 - PlatformIO Community
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