Digits on IOS "use data only" can't complete setup/signin

magenta1782376wp

    I am travelling in Germany and attempted to sign in to digits on an iPhone (latest ios) with a Vodafone.de SIM.  The signin with my Tmobile ID is ok and then says to enter phone number of device or if international or no SIM to click "Use Data Only".  I try to click "Use data only" and the app doesn't move any further.  On my Tmobile device (andriod with registered digits app on wifi though) I get a pop up saying my IOS device just registered on Digits.  So it sounds like Tmobile is working but the IOS app does not work.

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