Trying to add a physical adapter to a virtual switch shows the following error: There are no free physical adapters to attach to this virtual switch.
Probably you have the ESXi Version 6.5 and Client Version 1.21
Update the ESXi Client version 1.24 (or latest version)
- Download the version from this link (Sign in first to VMware)
- Move the .vib file the data store.
- Run the following command on the ESXi host: esxcli software vib update -v “datastore path/filename.vib” See image below.