A web-based tool in Microsoft 365 that enables users to quickly create surveys, quizzes, polls, and feedback forms.
Hi Ksenia,
We appreciate that you posted back and confirmed the scenario with us.
We have checked your description again, and we found that you went to Microsoft group form and created a new form, then you tried adding it to Microsoft Teams.
If my understanding is right, according to the screenshot you provided, it seems that you went to Microsoft Teams Channel > New conversation, and clicked Forms icon, then you cannot select the form from Microsoft Forms.
If so, and if you want to add forms from Microsoft Form, you can go to click Add a tab inside Channel, as shown below:
Then you can add Form tab, then you can select Add an existing form, as shown below:
You can refer to the steps above to check if you can add exiting forms.
For the screenshot you provided, the way you was trying is to add a quiz, so you may not use that way to add exiting form.
If the scenario above is not consistent with yours, you can also post back and point that.
Best Regards,
Sukie