Some have been asking about backgrounds and blur feature on student devices so we researched and wanted to share:
From what we found Chromebooks have to be on version 86 or later for the background and blur options. We control the version our devices are allowed to update to and have them on version 85 as we never move to the latest version in case there are issues. Version 87 is now available so we have just increased the allowed version to 86. Once the Chromebooks update that should allow the students to see the background blur options. Currently there are no controls in the admin console to enable or disable this feature so we are confident this should resolve the issue.
Original release notes from Google: https://support.google.com/meet/answer/10058482?co=GENIE.Platform%3DDesktop&hl=en
Hope this information is helpful as you move forward.