@etamminga We have a known issue affecting patch version upgrades specifically for MX node groups when called via the API. This is not impacting other nodes (MS, MR, etc.) or full version upgrades like MX18.208. In your example above, if you upgrade to "id": "2850" for MX18.208, the call will be successful. Please open a support case with us so we can track this issue and keep you updated with any developments.
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