Vive Lenscase has separated from the main headset

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Mariner24
Settler

Vive Lenscase has separated from the main headset

Hello, I own an arcade. 9 HTC Vive Pro headsets and am a member of the Viveport Arcade. A few of my headsets have separated into two pieces. The lens case and the adapter headset. What is the bestway to secure the the components back together?

 

Also I have had no success in playing multiplayer games with the 4 stations I have running Viveport Arcade, neither through "Play with Friends" or "Search by IP" options in the games. any advice?