Thank you for posting query in Microsoft Q&A Platform.
Artifact store is a storage location where metadata and linage information is stored. It could be due various reasons such as network connectivity or privileges what your id has and may be due to temporary service disruption. Kindly check all above possibilities to avoid this.
For reason, if still it does not work. then I would encourage you to have a support ticket for more deeper investigation and resolution. Click here for same.
Hope this helps. Please let me know if any further queries.
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