client firewall blocking windows permission settings

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We are migrating from EPS to avast for business.
I am installing the client onto laptops (Windows 10 1803, 64bit).
In Windows, avast firewall blocks the process when I go to change security permissions on any piece of software.
E.g. right-click CCleaner or Libreoffice -> Properties -> Security tab -> Add-> Here you add users/groups. the firewall is blocking communication to the server.

I'm suspect it's a matter of changing firewall permissions or adding exceptions, but that's where I'm stuck.
Thanks in advance, folks.

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I am having he same issue, turn off firewall and no problem, turn it on and you can't find users to add to folder security.

did you ever figure out a fix other than turning off Avast firewall?

AVast Business Antivirus Pro 18.6.2540

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Same issue here, anti virus blocking all sort of local traffic to the Synology for example. Even adding the application to allow everything it still won't do it.

Looks like I will be disabling the firewall as it is causing too many issues for the 50 users we have.