bossac with tinygo flash: `bossac: extra arguments found`

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Hi,
I am having issues flashing using TinyGo, when running command:

tinygo flash -target arduino-nano33 examples\blinky1

and the error I am getting points to bossac with the following error message:

bossac: extra arguments found

Here is more context of the command issued:

C:\>tinygo flash -target arduino-nano33 examples\blinky1
bossac: extra arguments found
Try 'bossac -h' or 'bossac --help' for more information
error: failed to flash C:\Users\Lorenzo Amante\AppData\Local\Temp\tinygo725274639\main.bin: exit status 1

I have installed the 1.9.1 client version, on a Windows 10 Pro.

Thank you.