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This error is thrown when I try to subscribe to a platform event using the EMP-connector. I followed the steps outlined in the documentation:

https://developer.salesforce.com/docs/atlas.en-us.220.0.platform_events.meta/platform_events/code_sample_java_add_source.htm

https://developer.salesforce.com/docs/atlas.en-us.220.0.platform_events.meta/platform_events/code_sample_subscribe_custom_events.htm

and get:

    Exception in thread "main" java.util.concurrent.ExecutionException: com.salesforce.emp.connector.CannotSubscribe: Unable to subscribe to [/event/Low_InkA__e:-2] [https://xxxxxxxx.salesforce.com/cometd/39.0] : 403:denied_by_security_policy:create_denied
    at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
    at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
    at com.salesforce.emp.connector.example.LoginExample.main(LoginExample.java:74)
Caused by: com.salesforce.emp.connector.CannotSubscribe: Unable to subscribe to [/event/Low_InkA__e:-2] [https://xxxxxx.salesforce.com/cometd/39.0] : 403:denied_by_security_policy:create_denied
    at com.salesforce.emp.connector.EmpConnector$SubscriptionImpl.lambda$subscribe$1(EmpConnector.java:94)
    at org.cometd.common.AbstractClientSession$AbstractSessionChannel.notifyOnMessage(AbstractClientSession.java:598)
    at org.cometd.common.AbstractClientSession.notifyListener(AbstractClientSession.java:314)
    at org.cometd.common.AbstractClientSession.notifyListeners(AbstractClientSession.java:289)
    at org.cometd.common.AbstractClientSession.receive(AbstractClientSession.java:261)
    at org.cometd.client.BayeuxClient.processMessage(BayeuxClient.java:821)
    at org.cometd.client.BayeuxClient.processMessages(BayeuxClient.java:617)
    at org.cometd.client.BayeuxClient.access$3100(BayeuxClient.java:100)
    at org.cometd.client.BayeuxClient$MessageTransportListener.onMessages(BayeuxClient.java:1186)
    at org.cometd.client.transport.LongPollingTransport$2.onComplete(LongPollingTransport.java:232)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:193)
    at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:185)
    at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:454)
    at org.eclipse.jetty.client.HttpReceiver.responseSuccess(HttpReceiver.java:401)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.messageComplete(HttpReceiverOverHTTP.java:266)
    at org.eclipse.jetty.http.HttpParser.parseContent(HttpParser.java:1403)
    at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:1245)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.parse(HttpReceiverOverHTTP.java:156)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.process(HttpReceiverOverHTTP.java:117)
    at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.receive(HttpReceiverOverHTTP.java:69)
    at org.eclipse.jetty.client.http.HttpChannelOverHTTP.receive(HttpChannelOverHTTP.java:89)
    at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onFillable(HttpConnectionOverHTTP.java:123)
    at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)
    at java.lang.Thread.run(Thread.java:745)

The event on Salesforce is:

Salesforce platform event

What's the cause of the error?

I found a few possible reasons:

https://developer.salesforce.com/forums/?id=9060G0000005myAQAQ

https://developer.salesforce.com/forums/?id=9060G000000MPEbQAO

but there doesn't seem to be a typo in the event's name or the account's privilege level.

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