NET::ERR_CERT_COMMON_NAME_INVALID error

Hi @Pradeep

the second line is the answer of your first line.

Create one certificate with both domain names.

There is a check of your domain - https://check-your-website.server-daten.de/?q=chicagotraffictracker.com - ~~40 minutes old.

Your chain is wrong:

Chain - duplicate certificates 1 CN=chicagotraffictracker.com
2 CN=chicagotraffictracker.com
3 CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US

The first certificate is duplicated.

But first create a correct certificate.