Energy classes for monitors and other appliances were changed in 2020, the classes A+++, A++ and A+ were removed. The rating system for energy efficiency now uses A, B, C, D, E, F and G. Nothing to worry, it still is a very energy efficient model.

Although I do strongly recommend to return the screen, also because of the mediocre 1920 x 1080 pixel resolution. Text is very fuzzy and does not appear sharp on a 24 inch screen with this resolutinon and it is definitively much worse with 27 inch in size.

For 27 inch, the minimum resolution should be 2540 x 1440 pixels, although I would hilgly recommend to go with 3840 x 2160 pixlels 4K and then use the 125% scaling on Windows 10. Text will be crisp and sharp. The least expensive solution, and even in 31.5 inch at the time I replied to this question would be less than 360 CHF for 4K UHD (and with 32 inch you could even use 100% scaling) is this Benq:

BenQ EW3270U (32", 3840 x 2160 Pixels)