Installing app results in "Testflight is currently unavailable"

Have been getting this message all week on 2 devices (both iphone 6s). Testflight status is green.

App Store Connect Users page says the app is installed on the 2 devices, but it is not. I fails to install with this message "Testflight is currently unavailable. Try again later."

Is iphone 6s still supported?


Installing app results in "Testflight is currently unavailable"
 
 
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