WIFI Authentication Certificate not Trusted

Question

Hello,

I have NPS role configured on my AD (in Azure) and have successfully configured the NPS role for WIFI authentication using username and password. However, when authenticated by username and password, my certificate pops up on my iOS device to show it is not trusted. Everything works, in terms of user is able to connect to sites successfully, its just the trusted certificate issue I am facing.

I do have RDS configured also, using the same certificate and that has no issues, so I know the certificate is trusted.

I have checked the NPS logs in Event Viewer and doesn't mention anything about the certificate not being trusted.

Any help / advise appreciated.

Thanks