As of July 23, 2022, VMware has officially released vSphere version 7.0 U3g. The vCenter 7.0 U3g release specifically addresses an issue seen in 7.0 U3f for users where the vCenter is or was previously joined to an Active Directory domain that used Integrated Windows Authentication (IWA) as an identity source.
VMware KB 89027 addresses the issue and associated workarounds in much more detail, but that’s the big item that is addressed in this particular release.
Please note: VMware ESXi 7.0 U3g wasn’t included as part of this release announcement. As of this writing, this U3g update applied to vCenter Server only.
vCenter Server 7.0 U3g | Build 20150588
Release Notes: https://docs.vmware.com/en/VMware-vSphere/7.0/rn/vsphere-vcenter-server-70u3g-release-notes.html