inControl2 "Save Failed" when trying to apply content blocking changes

Not sure what the issue is. I have a ticket open for another issue after 8.4.0 update. Was sent a special fw update but the inControl2 schedule didnt push it.

Now been trying to apply content blocking changes and I get “Save failed” error message.

I am able to to connect to remote admin to my router, so seems not related to connection to router.

Anything else I should be checking, error logs somewhere that could provide more details?