Hey there, Uladzislau Siarebranikau
Thanks for the additional information. From what you have said, it looks like the system has blocked your account due to the age verification not being completed. On top of this, it is not allowing you to complete the age verification because you don't need to in the region you are located in.
Please can you try changing your region back to the UK. Once you have changed your region back to the UK, please try completing the age verification using your passport (I don't know if it will accept your driving licence if it is a Polish driving licence). You can trigger this via this link: https://aka.ms/XboxUKAgeVerification
Once you have done this, and it has been successful, please change your region back to Poland and see if this allows you to update your privacy and online safety settings again.
What I am unsure of, and would need to ask about, is if Xbox Support are able to reset this on their end. You can learn more about this process here: https://news.xbox.com/en-us/2025/07/28/xbox-age-verification-uk/
Hope this helps,
Nathan