Michal Marek It seems that the interest in trying out the iWork office suite in iCloud is too high and Apple is not able to serve all those who are interested. The beta version of this news is k available to the general public barely a week but the amount of people who want to try the product is too much. That's why Apple started restricting access.
The warning in the image above appears to some users when they try to launch a trial version of one of the iWork products (Pages, Numbers, or Keynote) on iCloud.com. Access is denied to them and it is not written when it will be restored to them again. They are only encouraged to try again later. However, it should be noted that the unavailability of these tools does not in any way affect the ability to store documents in iCloud.
Developer access continues to work without problems.