Hi Ronny,
Thank you for reaching out. I appreciate your query about whether the Galaxy A42 has a fingerprint scanner and a face recognition feature. To answer your question, the device has those features.
Please see its user manual on Page 5, 29, and 30 for the fingerprint scanner information:
https://downloadcenter.samsung.com/content/UM/202107/20210715234857838/SAM_A426_EN_UM_R_11.0_032621_FINAL_AC.pdf
Also, go to Page 28 for the Face recognition information:
https://downloadcenter.samsung.com/content/UM/202107/20210715234857838/SAM_A426_EN_UM_R_11.0_032621_FINAL_AC.pdf
Should you need more assistance, you may reach us via the following for immediate support:
1. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
2. Facebook Messenger: http://m.me/samsungsupport
3. Twitter: https://twitter.com/messages/compose?recepient_ id=18768513
Reference Number: 1144239894
Thank you for choosing Samsung. Have a great day!
^Chrystel