Test-AzStackHciARBStack Fails on Non-Numeric Az CLI Extension Versions

March 6, 2026 ยท View on GitHub

Symptoms

  • Environment Validator fails in the Test-AzStackHciARBStack function with an error related to parsing az cli extension versions containing non-numeric characters (e.g., "1.0.0b1").
  • Error message similar to: Exception occurred (Test-AzStackHciARBStack): Cannot convert value "1.0.0b1" to type "System.Version". Error: "Input string was not in a correct format."

Summary

A bug in the Environment Validator's Test-AzStackHciARBStack function causes it to fail when az cli extensions have non-numeric version strings (such as beta versions like "1.0.0b1").

Applies to:

  • Azure Stack HCI releases 2601, 2602, and 2603 only.
  • Note: From release 2604 onwards, the validator has been reworked and no longer checks extension versions in this way.

Mitigation

Refer to the main TSG for incompatible az cli extensions for mitigation steps: