IoT's RegisterThing intermittently not working

Question

I successfully use CreateKeysAndCertificate via an MQTT topic (IoT provision by claim).  But then when I  use RegisterThing via an MQTT topic, it only works about 50% of the time, even though my IoT code and AWS  settings remain unchanged.

My pre-provisioning hook Lambda is called every time by RegisterThing according to the CloudWatch logs.   And the Lambda simply returns `allowProvisioning : true` every time within 200 ms according to CloudWatch.   But HALF the time nothing ever comes back on `$aws/provisioning- templates/myThing/provision/json/rejected` nor `$aws/provisioning- templates/myThing/provision/json/accepted`.  RegisterThing is kind of a black box in the cloud, so is  there something I can do?

Edit: It seems that when the ***previous*** call to RegisterThing (via MQTT) was made longer than ~ 5  minutes ago, a call to RegisterThing fails to publish its success to the `$aws/provisioning-templates/myThing/provision/json/accepted` topic.

I want $100 or a job offer for rigorously experimenting to discover this rather obscure issue...  Ha!  But  seriously, I'd appreciate if someone else can confirm on their end what I'm seeing.

Answer

"Hello darkness, my old friend,
I've come to talk with you again,
Because a vision softly creeping,
Left its seeds while I was sleeping,
And the vision that was planted in my brain
Still remains
Within the sound of silence." - Simon and Garfunkel

IoT's RegisterThing intermittently not working

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