Based on the screen captures you posted - it looks like you are using G Suite for your email. If that is the case, I typically just set up the 2nd domain as an alias - if you do not have G Suite and you want to use the forward for email you need to change the MX records to those show .
You would need to REMOVE the google records.
The google records you have are for using G Suite - which is Google's hosted email system
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