Unable to remove AirTag

Hello christianpawlik,

Since having this issue have you had the opportunity to restart your iPhone? If not, restarting is a great step that can help resolve many issues. If you need to reference the steps for restarting your iPhone, those steps are outlined below. You can also find these steps outlined in the following article.

1. "Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo."

Restart your iPhone - Apple Support

Let us know how that goes