Note: From August 1, 2017, modern authentication is enabled by default for Exchange Online, Skype for Business, and SharePoint Online. You migrate your mailbox to Office 365 from an Exchange server that Outlook connects to by using RPC.Microsoft Outlook connects to your primary mailbox in an on-premises Exchange server by using RPC, and it also connects to another mailbox located in Office 365.Here are a couple of scenarios of how this can happen: Why did Outlook not accept the credentials, and what is the solution for Outlook prompts for password after migration to Office 365? Solution for Outlook prompts for password after migration to Office 365 The only Exchange Server that will stay on-premises is Exchange Server 2016. After the migration to Office 365 completes, the decommission of Exchange 2010 servers will start.
The Exchange Server 2016 is going to be the Exchange Hybrid server. Looking at the organization, we can see that three Exchange Servers are running: Filling in the credentials will not help you because it keeps asking for credentials. After waiting for minutes, a prompt shows up to enter credentials. After you finish completing the mailbox to Office 365, the user starts Outlook. The mailboxes/mailbox databases are currently on Exchange 2010. Outlook prompts for password after migration to Office 365 Add registry key AlwaysUseMSOAuthForAutoDiscover.Enable modern authentication in Microsoft 365 admin center.Solution for Outlook prompts for password after migration to Office 365.Outlook prompts for password after migration to Office 365.
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