I couldn’t tell you for sure, but it sounds like something else is already in ownership of the port. udev won’t work if it is denied permission, e.g., if the file is locked by a process. The default should be that group “dialout” has read-write permissions for unowned serial UARTs. The existence of group “tty” implies the device is a terminal (e.g., serial console) and is not available for other uses.
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