Exclude Filter for Mac OS System File not working

Duplicati gives a warning message for a certain system file that is protected and cannot be accessed or modified. It looks like a file but is supposed to be a folder. The warning message is:
Error reported while accessing file: /Users/Monstergerm/Library/Containers/com.apple.mail/Data/DataVaults/

Failed to process path: /Users/Monstergerm/Library/Containers/com.apple.mail/Data/DataVaults/

I setup filters with above path to exclude DataVaults both as file and folder but still get those warning messages. I also tried “name contains DataVaults”. What else can I try?