teams chat issue with Skype for business

IBN 4,476 Reputation points
2022-06-16T11:51:30.557+00:00

Hello

Please i need your help on this

we are receiving message from skype for business server environment but we can not send message.

We got the error message: We ran into a problem sending your message. Please share diagnostic code 408/16816 with your admin to help them troubleshoot the issue.

211970-skype-user.png

When i tried changing the co-existence mode to island i get the error

212112-image.png

Teams user cannot send a message to Skype for business user

Microsoft 365 and Office | Skype for Business | Windows
Microsoft Teams | Microsoft Teams for business | Other
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  1. JimmyYang-MSFT 58,646 Reputation points Moderator
    2022-06-17T06:54:43.78+00:00

    Hi @IBN

    Which client does your contact use? Skype or Skype for Business?

    Above all, please check if the contact user's domain is allowed in Microsoft Teams Admin Center > Org-wide settings > External access.

    212339-image.png

    Based on my experience, if a Teams only mode user chat with an external contact who is in Islands mode, the message will be sent to the external contact’s SFB client. And if this contact is OFFLINE, then our user will receive the error messages like you posted. Please check if this is your case.


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