Windows Update on VMs seems to only work one at a time

I have a handful of Win 2012 R2 VMs (running on ESXi) I've inherited. I've tried 3 or 4 times to update them now since taking them
over, and noticed the strangest thing - only one of them will download updates at a time. If I start the update on all of them, the others will just hang at 0%. A little while after one finishes, another one will finally start to download. I'm completely stumped
as to why/how this could be happening. Is this even possible, or just an incredibly strange coincidence? Is there anything I can check to prove one way or the other? I'm wondering if it's something odd like they were all cloned from one base VM in some odd
way such that WU is seeing them as the same server when they try to connect or something... Other computers can connect to WU while this is happening; it's just this little cluster of VMs that were all built together.

Hi Allison,
Just addition. Did you check if those problematic VMs can access internet at the same time? For example, can
those VMs browser any webpage successfully at the same time, not just download updates? Meanwhile, please check if there has policies on router ports to limit the number of MAC addresses per port.
Hope this helps.
Best regards,
Justin Gu

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