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I'm not from MS and since you've gone through their support, I assume this has been covered, but just in case, have you confirmed the Windows Update Health Tools is deployed to all devices? I thought it was included by default, but found that some of our machines were missing this.
Great question. Yes, I used an Intune remediation script to ensure the Update Health Tools was installed on all our workstations, and to install it on the few where it was missing.