anonymous user ,
I have confirmed that there was a transient error which could have caused this.
If you are still facing the error and\or would like us to analyze the root cause, please reach out via an azure support ticket. While on you IoT Central App, you can open a new ticket using the help icon (?) on the top-right:
In case the information in this post is helpful , please feel free to mark this response as answer so that it can help others searching for similar questions.
Thanks!