When trying to enter the SPTX address dictated over the phone, I'm only able to get a few digits at a time, but returning to the phone app to press 2 to repeat

When trying to enter the SPTX address dictated over the phone, I'm only able to get a few digits at a time, but returning to the phone app to press 2 to repeat the address clears all progress in the other app where I'm trying to enter it. I battled through it and even double checked the address but it still failed. If that's part of the game, then fair enough, but I'm not doing that again so that's the end of the line for me.