PATCH /subscriptions/{id} shouldn't require both properties

Describe the bug

As per the documentation, PATCH https://graph.microsoft.com/beta/subscriptions/{id} requires only 1 property to be defined. Unfortunately, as confirmed by this customer, the Java SDK requires both properties to be specified or the request fails with this error message:

Subscription must contain either the 'expirationDateTime' or 'notificationUrl' property and its value.

More details on the bug as reported by the customer @Yusvanth are in Microsoft Graph Q&A

The feature engineers have confirmed that this issue doesn't occur on the REST API or other SDKs.

Please assist to resolve the bug.

Expected behavior

Only the expirationDateTime property is required.

How to reproduce

See the customer issue + CxP response.

SDK Version

No response

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

</details>


### Configuration

_No response_

### Other information

_No response_

Start by tracing the Java SDK handling for PATCH /subscriptions/{id}, using the linked Microsoft Graph documentation and customer issue as the reproduction context. Verify that a request containing only expirationDateTime is accepted, and confirm that the existing validation or request behavior no longer requires notificationUrl.