Request dashboard credentials

Good Morning,

After updating the report server to the January 2019 version, some dashboards started requesting user and password for viewing.

Follow the image with the message "your connection to this site is not private".

https://1drv.ms/u/s!AvdvqhTl8gnGm1oUGZwNsT2IIzEF

Any idea how to solve the problem?