[guide|113133|Take a look at this picture|stepid=216214]. There are five yellow circles. The sensor - a microswitch - is located in the recess directly below the top right-hand mark. Use your fingertip to feel it clicking. Press it with a toothpick or similar tool, the machine then "thinks" that the brewing unit is installed. The drive moves to the home position, after which the brewing unit should fit again.
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=== Update (02/17/25) ===
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I found a [link|https://youtu.be/rhGANOrfSJE?si=ZwYAE-hcJpCYXIRd|video].
[guide|113133|Take a look at this picture|stepid=216214]. There are five yellow circles. The sensor - a microswitch - is located in the recess directly below the top right-hand mark. Use your fingertip to feel it clicking. Press it with a toothpick or similar tool, the machine then "thinks" that the brewing unit is installed. The drive moves to the home position, after which the brewing unit should fit again.