Troubleshooting

Client View
Wrong XML 
Check that your client has a certificate to authenticate and that you are using the correct WiFi configuration profile or XML.
Trusted Root issues 
Check that you've done the following: 
Told your RADIUS Server which certificates are allowed to connect as described here​
Imported the active RADIUS Server certificate as trusted root on your client as described here​
Also check your Logs. There is a detailed description of the error. Maybe it's this issue.
If your Clients need to verify on connecting the first time, and you're seeing this dialog:
Make sure that you have referenced the Server certificate in your WiFi Profile:
Server View
Unknown CA
if you see something like this in your Logs:
Mon Jul 12 12:38:09 2021 : ERROR: (14872) eap_tls:   ERROR: SSL says error 20 : unable to get local issuer certificate
Mon Jul 12 12:38:09 2021 : ERROR: (14872) eap_tls: ERROR: TLS Alert write:fatal:unknown CA
Mon Jul 12 12:38:09 2021 : Error: tls: TLS_accept: Error in error
Mon Jul 12 12:38:09 2021 : Auth: (14872) Login incorrect (eap_tls: SSL says error 20 : unable to get local issuer certificate): [host/8dc38402-20fb-41db-a8f3-4e4e95637173/<via Auth-Type = eap>] (from client contoso port 1 cli 18-9K-EA-0H-7F-C5)
It can be one of this options: 
1.Your RADIUS server doesn't know the issuer of the certificate which was used for authentication. Add your CA as described here.
2.Your Client doesn't know the Server certificate and rejects the connection. Check that you've added your Server certificate as described here.
3.You've changed/added a new Server certificate and your XML profile on the client is using the old one. In that case, please double-check that you've either updated your WiFi/Wired profile or re-generated your XML after adding the certificates and pushed that to your clients. 
Fatal decrypt error
If you can see something like this in your Logs:
Wed Apr  7 08:14:39 2021 : Auth: (312) Login incorrect (eap_tls: TLS Alert write:fatal:decrypt error): [host/00128t09-cbna-469c-9768-2783d28eikl9/<via Auth-Type = eap>] (from client contoso port 1 cli 84-FD-D1-8C-0E-33)
Wed Apr  7 08:14:41 2021 : ERROR: (320) eap_tls: ERROR: TLS Alert write:fatal:decrypt error
Wed Apr  7 08:14:41 2021 : Error: tls: TLS_accept: Error in error
... then it is probably a bug of the TPM software on your Windows machines. More information on that can be found in the SCEPman documentation.
The setting Key Storage Provider (KSP) determines the storage location of the private key for the end-user certificates. Storage in the TPM is more secure than software storage, because the TPM provides an additional layer of security to prevent key theft. However, there is a bug in some older TPM firmware versions that invalidates some signatures created with a TPM-backed private key. In such cases, the certificate cannot be used for EAP authentication as it is common for Wi-Fi and VPN connections. Affected TPM firmware versions include:
STMicroelectronics: 71.12, 73.4.17568.4452, 71.12.17568.4100
Intel: 11.8.50.3399, 2.0.0.2060
Infineon: 7.63.3353.0
If you use TPM with this firmware, either update your firmware to a newer version or select "Software KSP" as key storage provider.

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