In the first case I couldn't find a real cause. It seems that the iPad sometimes freezes and just forgets to show the keyboard.
This was the case for many users in the Apple forum after they installed an iOS or iPadOS update. In my case, however, it was a brand new iPad 10 with iPadOS 16.3.1 - not a version that you would expect to have teething problems.
Still, the restart helped for us.
Here's a quick jaunt on how to restart iPad because I had to look it up myself:
iPad without home button (all current models) → Press and hold the top button and one of the volume buttons at the same time, then drag the slider.
iPad with home button → Hold the top button and then move the slider.
2. A real keyboard or mouse is connected to the iPad
If an iPad doesn't show an onscreen keyboard, it could also be because a Bluetooth keyboard was connected at some point and automatically reconnected to the iPad because it was nearby.
According to one user, after pairing a Logitech mouse with the iPad, the onscreen keyboard stopped appearing on them.
You can quickly check whether this is the reason by going to the control center Turn off the Bluetooth temporarily and see if a keyboard is now displayed on a text input window.
If you want to unpair a connected keyboard from the iPad, you can do this under Settings → Bluetooth.
If you have noticed other causes or you still have ideas how to solve the problem with the missing on-screen keyboard, please leave a comment here.
I am happy to add the good tips at the top of the article so that future readers can benefit from them.
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.
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In the Sir Apfelot Blog you will find advice, instructions and reviews on Apple products such as the iPhone, iPad, Apple Watch, AirPods, iMac, Mac Pro, Mac Mini and Mac Studio.