POST /

Content-Type: application/x-www-form-urlencoded

Action=ModifyVerifiedAccessInstance&CidrEndpointsCustomSubDomain=__CidrEndpointsCustomSubDomain__&ClientToken=__ClientToken__&Description=__Description__&DryRun=true&VerifiedAccessInstanceId=__VerifiedAccessInstanceId__&Version=2016-11-15