According to the Samsung homepage https://www.samsung.com/ch/tvs/oled-tv/s90c-77-inch-qe77s90catxzu/ and the device specs, it says Slim Fit Wall-mount Support - Yes. Otherwise ask Samsung directly...

Hello DAaviide The brackets are for different models based on the year of manufacture (look for the letter A or B in the designation.... ...A50... or ...B50...). If you get the wrong one, it won't fit. Had the same problem, unfortunately. 🤷🏻‍♀️ Best regards

The Samsung WMN-B50EB/XC Slim Fit Wall Mount is compatible with 2022 TVs BU8070 - QN900B 43-85" (except Q80B) and 2021 TV AU8070-QN900A 43-85" (except Q80A).

The compatibility of the brackets is different, this model is for all 2022 models except for these two models: Samsung Q80B & LS03B. So this bracket should be compatible with your TV. Unfortunately, this bracket is no longer available.

This model (WMN-B50EB/XC) is compatible with: 2022 TVs BU8070 - QN900B 43-85" (except Q80B) 2021 TV AU8070-QN900A 43-85" (except Q80A) WMN-A50EB/XC is compatible with: AU8000-QN900A (43-85") excl. Q80A

According to our information, this should fit. However, the maximum weight must not be exceeded.