When I set a file Path as an Exception in Avast it does work but only for a short time (~60min) than it just removes the entries from the List and deletes the Files in the Excluded directory.
I admit I don’t know that much about Avast Business - but aren’t the settings you changed reverted by the “master” console that propagates the settings to the connected workstations?
That might be the case but if so why should I be able to change it in the first place and it does work while the Execption is in the list. Only after a short while it will get deleted and work no longer.