Issue sending emails in Salesforce through my Office 365 Account

Smith, Alonda 0 Reputation points

Hello, I had my Salesforce emails setup to send through Office 365 and I've noticed that I am not able to send these emails anymore, none of the Salesforce users. The option pops up to to allow me to select Yes, Connect to Office 365, but when I select this option, I'm receiving the following error: AADSTS7000112: Application '29104cd9-d43e-40db-ad10-2fd98c6803ba'(Salesforce) is disabled. Speaking with IT, I was informed that 2fd98c6803ba (Salesforce) is an old Salesforce instance it's trying to connect to. We have not used this old instance in five years or more. I informed IT that this is something on their end that that has changed and being mapped incorrectly and was told it's a Salesforce issue, which it's not and I've confirmed with Salesforce.

Can someone point me in the direction of where the IT team should be looking to get this resolved? As I mentioned before, I was using this just find around 8 months ago and prior, and somehow, something has changed.

Thank you in advance for any assistance.

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Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
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A family of Microsoft email and calendar products.
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  1. Kael Yao-MSFT 37,676 Reputation points Microsoft Vendor

    Hi @Smith, Alonda

    Please kindly note that Salesforce emails is a third-party application, which we may not be very familiar with.

    And since this issue may be more related to Microsoft Entra ID (Azure AD), to get better support I would suggest creating a new thread and add the Microsoft Entra ID related tags.

    Thanks for your understanding.

    To check from Azure AD (Microsoft 365) side, please suggest your IT team to access Microsoft Entra Admin Center to have a check if the application is added as an enterprise application.

    An example in my lab:


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