Board Thread:New Features/@comment-45689497-20201005163027/@comment-9605025-20201005195044

Which wiki is this on? Is it a UCP wiki? If so, were are you trying to use the strikethrough? If you are talking about Discussions or any of the other discussion features, you can't use it in those posts. If you are talking about regular wiki content or posts on a legacy discussion feature, then it should work.