Mirroring from Samsung TV to Samsung S9 phone used to work for me via Smart Things until recently. I saw this post and tried but it never connected and after a few secs went back to the device list. Then I went to ST settings and enabled the SmartThings panel. Then from my S9 notifications panel, I was once again able to select 'mirror tv to phone' and that worked. Not sure if I accidentally disabled that notifications panel or if it occurred as part of a recent ST app update, which is what I think happened based on the release notes.
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