I did.
The issue was a combination of a misconfiguration and a setting being changed.
We deploy our WIFI settings to clients via Intune and the CA server name defined was incorrectly configured.
This wasn't a problem as the setting for 'AcceptServerName' was set to false.
it doesn't seem to be possible to set 'AcceptServerName' in the Intune policy and I don't know how it got changed to 'true' but when it did, the clients started checking the server names that were authenticating them and as they didn't match they received the prompt noted in this thread.
The fix was to add the correct server names (those of our NPS servers) into the policy and when the clients received this they stopped receiving the warnings.
You can check the value of 'AcceptServerName' by exporting the WIFI profile using the command below:
netsh wlan export profile <ProfileName>
and viewing the output XML file.
I hope this helps, good luck