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Exchange 2013 Hybrid error when selecting 365 tab on ECP

Raymond Turrell 21 Reputation points
2021-02-17T19:41:56.773+00:00

Hi all
Hope you can help.
We have Exchange 2013 and I've run the hybrid the migration wizard with no errors at all.
My next step was to try to migrate a mailbox in ECP selecting the Office 365 tab and this is where I am stuck.
I see the following error...

login.microsoftonline.com refused to connect.

If I use a private browsing window then it prompts for a login and I pop in the main 365 admin account, I then get the same error.

I have ensured that all accounts I use have the Organization Management and Recipient Management role. I have confirmed that the MRSProxy service is on.

Really not sure what to do next to resolve this and would really appricate any help you can offer.

Exchange | Exchange Server | Management
Exchange | Exchange Server | Management
The administration and maintenance of Microsoft Exchange Server to ensure secure, reliable, and efficient email and collaboration services across an organization.
Exchange | Hybrid management
Exchange | Hybrid management
The administration of a hybrid deployment that connects on-premises Exchange Server with Exchange Online, enabling seamless integration and centralized control.
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  1. KyleXu-MSFT 26,396 Reputation points
    2021-02-18T03:10:59.757+00:00

    @Raymond Turrell

    I would suggest you login https://outlook.office365.com/ecp/ then try to migrate mailboxes directly.

    The conversion between Exchange on-premises and Office 365 tab is unstable, it also controlled by Brower settings, such as saved password and cookies setting.

    If the response is helpful, please click "Accept Answer" and upvote it.
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  1. Raymond Turrell 21 Reputation points
    2021-02-19T10:28:11.613+00:00

    Fantastic, thank you so much. Turned out our remote endpoint was wrong but fixed that and all looks great now.

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