Changed Gmail password on iphone now Macbook(High Sierra) Mail will not connect to server, receiving this message; "Failed to verify the server certificate. This could be because of your network configuration or your proxy settings."

Hello- Happy Holidays to all.

I had to change my Google/Gmail password on my iphone and now the Mail app on my Macbook will not connect to server and enable me to update the new password, nor will it connect to allow me to re-add the email account. I keep getting this notice but unable to move passed it or the prompts that pop up.

I have tried to follow and do what others have listed on here to fix the issue in the Network preferences....but none have worked. HELP, please.

Running 2015 17" MacBook with OS High Sierra..