Hello Narelle D,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I understand Trello Add-in is not working when you include attachments, getting error message “sorry, your card could not be added to Trello”.
May I know what version of Outlook do you have? What version of Outlook do I have? (microsoft.com). When did this issue start and did you make any changes prior to this happening? Please let us know for further troubleshooting and investigation.
In the meantime please try to update your Outlook if you are not using the latest update and check if the issue persist.
We are looking forward to your response. Thank you for your cooperation.
Sincerely,
Simbarashe | Microsoft Community Moderator
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Hi Microsoft,
I have the exact same issue. When will this be solved?
Thank you!