I'd try asking for help in dedicated forums here.
https://support.google.com/mail/community?hl=en
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I need to add my O365 to Gmail
i have the following error :
334 VXNlcm5hbWU6 334 UGFzc3dvcmQ6 535 5.7.139 Authentication unsuccessful, SmtpClientAuthentication is disabled for the Tenant. Visit https://aka.ms/smtp_auth_disabled for more information. [SA9PR11CA0009.namprd11.prod.outlook.com] , code: 535"
I'd try asking for help in dedicated forums here.
https://support.google.com/mail/community?hl=en
--please don't forget to upvote
and Accept as answer
if the reply is helpful--