After update 15.4.1 my keyboard will not pop up when reading and trying to respond to emails

Force-restart the iPad, and try again: Force restart iPad - Apple Support

Dkstew1111 Said:

"After update 15.4.1 my keyboard will not pop up when reading and trying to respond to emails: How to be able to respond to emails again"

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Revealing Keyboard on Mail:

Restore from a Backup:

Have a backup of your iPad that you made prior to this? If you are not concerned with losing data, then restore your iPad from a backup that contains this app. Prior to restoring, backup your iPad, incase anything goes wrong with the restoration. If you have no backup, then know to always backup your iPad, every-so-often.