Error with RADIUS

We are getting this error after following this free guide:
https://netknights.it/en/nps-2012-for-two-factor-authentication-with-privacyidea/

Error: Ignoring request to auth address * port 1812 from unknown client 172.16.0.191 port 52031 proto udp

Here is our client’s config:

client NPSServer {
secret = redacted
ipaddr = 172.16.0.191
}

That is where I am stuck so far. Wondering if this is my fault or if something is not working correctly.

For most people this information is far too sparse! Note, that this is not a support forum where you are taken at the hand and led through every single step of gathering enough information. To get help from the community, you probably need to provide more information on your own!
This might be a good read for you.