Hi there,
First, you need to make sure that not only the switch but all the VNICs are also available on all the cluster nodes.
You also need to make sure that all the Switches are bound to a Logical network on the host properties under the hardware section.
Run below PowerShell in SCVMM shell to find out if any of the logical networks are not selected for a given node:
Get-SCVirtualNetwork | ft name , logicalnetworks , VMHOST
Compare the information for all the cluster nodes and try to find out the missing bit.
If everything is exactly the same, then I guess the issue is with the VMM refresh job where it failed to query the switch information for a given node.
If none of them is helpful try setting up logical networks in the VMM 2019 UR1 fabric
https://video2.skills-academy.com/en-us/system-center/vmm/network-logical-ur1?view=sc-vmm-2019
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
--If the reply is helpful, please Upvote and Accept it as an answer--