Not able to enroll iPhone in MDM in iOS 14 with Self signed certificate

I have installed iOS14 on my iPhone and trying to enroll to a MDM server which has self signed certificate. The enrollment is throwing out an error that the server certificate is invalid. 

I have already installed the trust profile which has the certificate and enable full trust under General - About - Certificate Trust Store settings. 

The same device enrolls well when the device is on iOS 13.x but fails to enroll with iOS14.

Code Block 
iphone logs:
Install profile data, interactive error. Error: NSError:
Desc   : 描述文件安装失败
Sugg   : “https://192.168.22.30:443/iosapp/profile?tenant_id=mdm”的服务器证书无效。
US Desc: Profile Installation Failed
US Sugg: The server certificate for “https://192.168.22.30:443/iosapp/profile?tenant_id=mdm” is invalid.
Domain : MCInstallationErrorDomain
Code   : 4001
Type   : MCFatalError
...Underlying error:
NSError:
Desc   : “https://192.168.22.30:443/iosapp/profile?tenant_id=mdm”的服务器证书无效。
US Desc: The server certificate for “https://192.168.22.30:443/iosapp/profile?tenant_id=mdm” is invalid.
Domain : MCHTTPTransactionErrorDomain
Code   : 23002
Type   : MCFatalError
Params : (
    "https://192.168.22.30:443/iosapp/profile?tenant_id=mdm"
)
Extra info:
{
    isPrimary = 1;
}