Make sure the account it signed it with the browser window. Also you have permitted it from your Google Account. Extra Layers of security from your Google Id is barring you to synchronizing it. Try approving it from all platforms and provide OTPs sent on phone for verifications
Facing problem to sync Outlook to Gmail
I want to Sync my Outlook.com to Gmail Email to get all emails at one place. I tried to add it but I am getting this errors.
334 VXNlcm5hbWU6 UGFzc3dvcmQ6 Authentication unsuccessful [AM8P190CA0026.EURP190.PROD.OUTLOOK.COM]
Please help regarding this.
N.B: It is not an office 365 account just a free basic outlook.com mail
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Samreen Farooqui Prep S032- NN Girls Campus 11 Reputation points
2021-06-17T09:47:43.32+00:00 make sure that by signing in your outlook ID and adding your gmail account into it.
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Jade Liang-MSFT 9,976 Reputation points Microsoft Employee
2021-06-11T07:54:59.48+00:00 Hi @Imranul Bashar ,
I noticed that you are having trouble syncing other account configurations in Gmail, is it right? If so, please kindly understand here we mainly foucs on general issues about Outlook desktop client, I have researched a lot about it and found a similar thread in Gmail forum, please check if it's also helpful to you: "Authentication failed" message when configuring "send mail as" setting (Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
If that's invalid or you still need further assistance about it , it's recommended to post your issue in dedicated gmail forum directly, so that you could get more targeted help.
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