Mobile version not being triggered

Yesterday my app stopped using the mobile version that was set in the Index. It has worked perfectly for two years. There was no update yesterday, just had users start reporting that they were not seeing anything other than the index page. I have used a hard redirect as a fix but that is suboptimal. It’s also concerning that yet another mysterious change has somehow affected the app. Does anyone have any idea what may have changed and whether I can ensure that the mobile version is always triggered by users on smartphones so I can maintain the desktop version I need.

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