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AMS0EPF000001AD.mail.protection.outlook.com rejected your message to the following email addresses:
Don Stockton (******@outlook.com) A communication failure occurred during the delivery of this message. Please try to resend the message later. If the problem continues, contact your email admin.
Using New Outlook on Windows for personal email, calendar, and contact management
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Hello,
Is that the complete message regarding this bounce back? If not, can you please share the bounce email? It contains important diagnostic data that helps shed some light of the root cause. Please redact personal information when you share.
It is actually the response to a meeting invite that generates the following:
AMS0EPF000001AD.mail.protection.outlook.com rejected your message to the following email addresses:
[Don Stockton (******@outlook.com)] A communication failure occurred during the delivery of this message. Please try to resend the message later. If the problem continues, contact your email admin.
AMS0EPF000001AD.mail.protection.outlook.com gave this error: Requested action not taken: mailbox unavailable (S2017062302). [AMS0EPF000001AD.eurprd05.prod.outlook.com 2026-02-25T01:16:42.502Z 08DE6BF49565D63B]
Diagnostic information for administrators:
Generating server: PH7P220MB0883.NAMP220.PROD.OUTLOOK.COM
******@outlook.com AMS0EPF000001AD.mail.protection.outlook.com Remote server returned '550 5.5.0 Requested action not taken: mailbox unavailable (S2017062302). [AMS0EPF000001AD.eurprd05.prod.outlook.com 2026-02-25T01:16:42.502Z 08DE6BF49565D63B]'
Thanks!! That makes a lot of sense now. I will explain.
It sounds like you are using a third party email address, such as Gmail or Yahoo, as the sign-in username/alias for your Microsoft account. Is that correct?
When your Microsoft account uses a non-Microsoft email address, it does not have its own email functionality. The actual sending and receiving of emails still happens through your third party email provider. As a result, when you send a meeting invitation through Teams, Microsoft cannot access your external email to send it. Instead, it sends the invitation using a randomly assigned Microsoft email address, one that ends in outlook.com. This is why recipients cannot reply to the invite directly. However, your meeting itself is not affected.
To give your Microsoft account proper email functionality, you can create a Microsoft-based email alias and set it as the primary alias. Here is how:
Go to https://account.live.com and sign in to your personal account.
Click on "Your Info," then choose "Sign-in preferences," and select "Add an alias."
Choose to create a new alias. It will allow you to create one that's outlook.com.
After creating it, set it as your primary alias.
Keep your current third party email as a secondary alias. Do not remove it.