Invalid Request 409 when trying to subscribe to Microsoft Graph for Presence - microsoft-graph-api

Question

Executing a subscription to presence request for users with the SDK targeting the MS Graph API is resulting in an error:
409Graph service exception Error code: InvalidRequest
Throwable detail: com.microsoft.graph.http.GraphServiceException: Error code: InvalidRequest
Error message: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.
POST https://graph.microsoft.com/v1.0/subscriptions
SdkVersion : graph-java/v5.16.0
SdkVersion : graph-java/v5.16.0
[...]
400 : Bad Request
[...]
My code is:
final Subscription subscriptionRequest = new Subscription();
subscriptionRequest.changeType = ChangeType.UPDATED.toString();
subscriptionRequest.notificationUrl = notificationsHost;
subscriptionRequest.resource = "/communications/presences?$filter=id in ("+userIdsSb.toString()+")";
subscriptionRequest.clientState = subscribeToPresenceRequest.getClientState();
}el
subscriptionRequest.clientState = UUID.randomUUID().toString();
subscriptionRequest.expirationDateTime = OffsetDateTime.now().plusHours(1);
Subscription subscription = null;
try {
subscription = graphClient.subscriptions().buildRequest().post(subscriptionRequest);
response.setSubscribed(false);
failedIds.addAll(this.getFailedIds(e));
log.error("Error while trying to execute subscribeToPresence. ", e);
if(failedIds!=null && !failedIds.isEmpty()) {
log.error("The ids {} failed during the subscription request ",failedIds);
response.setFailedIds(failedIds);
}
}catch(Exception e) {
log.error("General Error while trying to execute subscribeToPresence. ", e);
retur
}
My subscription request includes the following values:
applicationId: null
changeType: UPDATED
clientState: 7fc6bf6b-6cc2-438d-a293-aa47539ad02a
creatorId: null
id: null
latestSupportedTlsVersion: null
lifecycleNotificationUrl: null
notificationQueryOptions: null
notificationUrl: https://myhost:port/graph/listen
notificationUrlAppId: null
oDataType: null
resource: /communications/presences?$filter=id in ('932b90ca-e5a4-42c7-a985-f4ddfc6d6715','6be2455d-63ac-4423-aa3e-7188fdbd5e73','41b3d168-5c28-4596-ba3b-d5c70a3c3967','8830a8bc-f882-4c13-b33a-7031423b5a24','ab548af7-d5a9-4388-9800-7668a20bb2b9')
expirationDateTime: 2023-02-02T16:41:11.737+02:00
includeResourceData: false
I saw this article regarding the beta version of the sdk https://learn.microsoft.com/en-us/graph/api/resources/subscription?view=graph-rest-1.0.
It indicates "Subscriptions to resources marked with an asterisk (*) are available on the /beta endpoint only." and presence is one of those resources. Is this related to my error?
I tried to use this version instead, but I still have the same Invalid request error.
I am using delegated permission to call the /subscription/presence endpoint of the Microsoft Graph API.
I was able to fetch previous subscriptions by calling /subscription endpoint and was also able to find users through /users/filter endpoint with application permission.
Is there something wrong in the format of my subscription request? This all worked fine a few months ago and I haven't changed anything.
Is this related to SSL/TLS secure communication? But then again, why would my other requests get responses?