When I create a meeting and send an invite, the acceptance returned to be is undeliverable

Question

When I create a meeting and send an invite, the acceptance returned to be is undeliverable

Stephen Mungavin 20

When a recipient gets my invite to a MS Teams meeting acceptances are not being delivered - seems to not recognise this email address Stephen Mungavin (******@outlook.com).

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Answer accepted by question author

EmilyS726 277.3K Independent Advisor

Hello,

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.

You can then check emails at https://www.outlook.com. If you prefer, you can also enable email forwarding in the settings so that all messages go to your usual email address and you do not have to check multiple inboxes.

Stephen Mungavin 20 Reputation points

2026-01-15T14:03:43.35+00:00

Great, many thanks EmilyS726 for the prompt & helpful response, much appreciated.

S

1 additional answer

Your answer

Stephen Mungavin 20 Reputation points

2026-01-15T14:03:43.35+00:00

Great, many thanks EmilyS726 for the prompt & helpful response, much appreciated.

S

Answer 1

When acceptance notifications for Microsoft Teams meeting invites are not being delivered, it could be due to a few reasons. One common issue is that the recipient's email address might be flagged as spam by their email provider, which can prevent the acceptance from being delivered. Additionally, if the recipient's user profile in Microsoft Entra ID does not have a valid email address assigned, this could also lead to undeliverable messages.

To troubleshoot this issue, you can ask the recipient to check their Junk or Spam folder to see if the acceptance notification is being filtered there. If it is not found, ensure that the recipient's email address is correctly set up in their user profile. Users with the User Administrator role can verify and update the email address in the Microsoft Entra admin center or the Microsoft 365 admin center.

If the email address is correct and not being filtered, it may be necessary to check if there are any issues with the email server or settings that could be affecting delivery.