In the given configuration, the trustpoint TP_AnyConnect is using a self-signed certificate (enrollment selfsigned). When using Cisco Secure Client (formerly AnyConnect) with IKEv2, the client expects a valid, trusted certificate issued by a Certificate Authority (CA).
Since self-signed certificates are not trusted by default, the client may reject the connection, causing the VPN tunnel to fail. To resolve this issue, the engineer should:
1. Obtain and install a trusted CA-signed certificate on the router.
2. Update the crypto pki trustpoint configuration to use the new certificate.
3. Ensure the certificate Common Name (CN) and Subject Alternative Name (SAN) match the VPN gateway's FQDN.