troubleshooting Question

Exchange 2016 getting bounce backs from google

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TechGuy_007Flag for United States of America asked on
* IPv6ExchangeGoogle
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Exchange 2016 getting bounce backs from google:

mx.google.com gave this error:
[2601:40d:8001:dc00:5436:c102:4af2:5c68] Our system has detected that this message does not meet IPv6 sending guidelines regarding PTR records and authentication. Please review https://support.google.com/mail/?p=IPv6AuthError for more information . f10si1906405ioi.62 - gsmtp

I cannot figure this out for the life of me. If it's as simple as a radio box I might just cry. lol
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Edward Pamias
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