That is still an automation, even if you didn’t create it through the “Automation creator“ in the app.
The kind of automation you create on the device page is called a “Quick Controls“ automation.
And the model number can make a great deal of difference in allowing other people to help you, so it’s good to give that information whenever you have it readily available.
By any chance, have you updated to the new 2021 version of the smartthings app in the last few days? A number of people have reported some issues with the Quick Controls Automations after they updated, and they had to edit and re-save them in order to get them to work again.
I just noticed that your first post does say that you did update to the new 2021 app. In that case, that’s a problem that several people have reported, very frustrating, but the only solution seems to be to edit the Quick Controls Automation and save it again.