OpenShift 4 AWS installation fails due to machineNetwork CIDR

Issue

• Deploying OpenShift 4 cluster on AWS using existing VPC fails due to invalid machineNetwork CIDR.

Invalid value: "subnet-07a7d790586ccd1d8": subnet's CIDR range start 10.69.1x.x is outside of the specified machine networks, 
platform.aws.subnets[1]: Invalid value: "subnet-0babad72exxxxxxxx": subnet's CIDR range start 10.69.1x.3x is outside of the specified machine networks, 
platform.aws.subnets[2]: Invalid value: "subnet-02fab648fxxxxxxxx": subnet's CIDR range start 10.69.1x.6x is outside of the specified machine networks, 
platform.aws.subnets[4]: Invalid value: "subnet-0db752d68xxxxxxxx": subnet's CIDR range start 10.69.1x.1x is outside of the specified machine networks, 
platform.aws.subnets[5]: Invalid value: "subnet-01e42f275xxxxxxxx": subnet's CIDR range start 10.69.1x.16x isoutside of the specified machine networks, 
platform.aws.subnets[3]: Invalid value: "subnet-0e157656dxxxxxxxx": subnet's CIDR range start 10.69.1x.9x is outside of the specified machine networks]