This setting is used in conjunction with SilentAccountConfig. Any user who has a OneDrive for Business that is larger than the specified threshold (in MB) will be prompted to choose the folders they would like to sync before OneDrive downloads the files.
Specify tenant GUID and the maximum size of a user's OneDrive for Business before the user is prompted to choose the folders they would like to sync.
In the name field, type the tenant GUID. Enter the size in the value field.
Valid values are from 0 to 4294967295 MB (inclusive).