I cannot email my invoices with QB 2020 for Mac.  I had NO PROBLEMS emailing invoices with QB 2016 for MAC, but once I upgraded to 2020 I can't do!.  Here's the error message:

Unable top authentic with the current session's credentials.  The server returned the response:  5.7.8. username and Password not accepted.  Lear more at 5.7.8 https://support.google.com/mail?p=BadCredentials x 12sm3487758qta.67 - gsmtp.

I went to this address and have no idea what to do.  Not everyone is a computer programmer and genius out there.  I could use some help from Intuit.  Thank you.