Bookings - No more notes or extra fields available

Hi there and happy new year to all.

Starting from mid-december, we are facing an issue with our company Microsoft Bookings: basically the custom fields (like address, notes and so on).
The book page will just ask for Name & Surname, E-mail Address and Phone Number.

On our Administration back-end, the Customer Notes fileds is greyed out (you cannot enable it), and all the custom fields disappeared, you have just the standard ones.

We have this issue in all our different booking pages, and all the services are affected.

Any hint about this?

Thanks!