Hello Varga Bence,
Thanks for your question.
Disabling 2FA completely might not be the best option. You can first attempt to login with an alternative method of authentication if the site allows. If this is not possible, in this case contact neptun11.uni-bge.hu l support.
You will need to follow the instructions provided by the support team to recover your account. This might include resetting your account/password and disabling 2FA temporarily so you can set it up again.
You can mark it 'Accept Answer' and 'Upvote' if this helped you
Regards,
Abiola