Customer is applying a custom login message to their environment, but the [SAVE] button remains greyed out:
vCenter 7.0 Update 3
The 'Terms and Conditions' hasn't been changed yet, so the [SAVE] button remains greyed out. Note the documentation:
https://techdocs.broadcom.com/us/en/vmware-cis/vsphere/vsphere/7-0/vcenter-and-host-management-7-0/using-the-vsphere-client-host-management/manage-the-login-banner-host-management.html
"You must replace Terms and Conditions with your own text."
Replace 'Terms and Conditions' with something else per the documentation and the [SAVE] button activates: