Module identity fetch issue

I have registered an edge device[gateway] to Azure IoTHub using x509 self signed certificate. The device got registered fine and modules [edgeAgent,edgeHub] got deployed along with some custom edge modules- with deployment status 200, device and modules status reporting. The modules are running on the edge device but the modules keep restarting as they couldnt authenticate.

edge Device registration is through x509 self signed certificate, with below properties in config.toml 

# Manual provisioning with x.509 certificates
[provisioning]
source = "manual"
iothub_hostname = "REQUIRED_IOTHUB_HOSTNAME"
device_id = "REQUIRED_DEVICE_ID_PROVISIONED_IN_IOTHUB"

[provisioning.authentication]
method = "x509"

identity_cert = "REQUIRED_URI_OR_POINTER_TO_DEVICE_IDENTITY_CERTIFICATE"

identity_pk = "REQUIRED_URI_TO_DEVICE_IDENTITY_PRIVATE_KEY"

Logs from edgeHub:

 [INF] - Unable to authenticate client <deviceid>/<custom_edge_module> with cached service identity <deviceid>/<custom_edge_module> (Found: False). Resyncing service identity...
<4> 2025-09-19 00:29:56.415 +00:00 [WRN] - Error while refreshing the service identity: <deviceid>/<custom_edge_module> OnBehalfOf: <deviceid>
System.Collections.Generic.KeyNotFoundException: The given key '<deviceid>/<custom_edge_module>' was not present in the dictionary.
   at Microsoft.Azure.Devices.Edge.Hub.Core.DeviceScopeIdentitiesCache.RefreshServiceIdentityInternal(String refreshTarget, String onBehalfOfDevice, Boolean invokeServiceIdentitiesUpdated) in /mnt/vss/_work/1/s/edge-hub/core/src/Microsoft.Azure.Devices.Edge.Hub.Core/DeviceScopeIdentitiesCache.cs:line 187

device twin status:

    "deviceScope": "ms-azure-iot-edge://<devicescope>",
    "modelId": "",
    "status": "enabled",
    "statusUpdateTime": "0001-01-01T00:00:00.0000000Z",
    "lastActivityTime": "2025-09-19T00:47:10.0840495Z",
    "connectionState": "Connected",
    "cloudToDeviceMessageCount": 0,
    "authenticationType": "selfSigned",
    "x509Thumbprint": {
        "PrimaryThumbprint": "<thumbprint>"
    }

Module identity twin of edgeHub:

    "modelId": "",
    "status": "enabled",
    "statusUpdateTime": "0001-01-01T00:00:00.0000000Z",
    "lastActivityTime": "2025-09-19T00:42:23.4967322Z",
    "connectionState": "Connected",
    "cloudToDeviceMessageCount": 0,
    "authenticationType": "sas",
    "x509Thumbprint": {}

module identity twin of edgeAgent and other modules:

    "modelId": "",
    "status": "enabled",
    "statusUpdateTime": "0001-01-01T00:00:00.0000000Z",
    "lastActivityTime": "2025-09-19T00:54:15.6085296Z",
    "connectionState": "Disconnected",
    "cloudToDeviceMessageCount": 0,
    "authenticationType": "sas",
    "x509Thumbprint": {}

The modules couldnt communicate to hub as they couldnt authenticate, where as the same modules works fine when the edge device is registered via shared access signature and send telemetry to iot hub.

Please let me know where could the issue be for modules not able to communicate with iotHub