See this thread. It's unfortunate that so many educators with their hearts in the right place are experiencing so much frustration with Chromebook/Arduino harmony.
https://forum.arduino.cc/t/actually-getting-arduino-to-work-with-chromebook-april-2024/1243586/13
Surely Arduino knows that millions of students these days are using Chromebooks in class? My son in Grade 9 doesn't have a single textbook - it's ALL Chromebook (for better or worse).
Once again, I have no idea if the issue reported by so many has been resolved and whether your particular issue is due to something else altogether.
Worth noting: I am no expert, do not speak on behalf of Arduino the company or any of the moderators in this forum. I am just a regular Joe hobbyist who makes Hallowe'en props and occasionally has useful advice to share with other forum members stuck on their projects somewhere.