azure-cli: "az keyvault secret set" failed with error "Max retries exceeded attempting to connect to vault"

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Describe the bug

Command Name az keyvault secret set

Errors:

Max retries exceeded attempting to connect to vault. The vault may not exist or you may need to flush your DNS cache and try again later.

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here…
• az keyvault secret set --vault-name {} --name {} --value {}

Expected Behavior

Environment Summary

Linux-5.3.0-1028-azure-x86_64-with-debian-9.11
Python 3.6.5

azure-cli 2.1.0 *

Additional Context