Bug?? Sharing teams Assignment posts

Hi guys

Has anyone come across a bug when sharing an Assignment post (ie a post that is created by the assignments bot when an assignment is created) using the "Share to Outlook function" a message is generated in the body of the email with text and a link as follows "Card - access it on https://go.skype.com/cards.unsupported."   

Any ideas what is causing this? The link is not entered by the user manually or taken by teams from the instructions or any attachments in the Assignment.

What is strange this is not happening every time, only certain posts cause this bug.

Appreciate your input.

Thanks

Michal