According to your Gigabyte Motherboard it does support 4400Mhz using XMP (OC): https://www.gigabyte.com/Motherboard/B550-AORUS-ELITE-V2-rev-10/sp#sp
![Screenshot 2021-11-09 105732.png](/skins/images/4B306F17E81D171E95F8E456EB72CA91/responsive_peak/images/image_not_found.png)
Make sure you have the RAM Module installed in the correct DIMM Slots to enable Dual Channel Memory.
Also it is possible the RAM you have is not 100% compatible if it isn't listed on Gigabyte's QVL LIST for RAM MEMORY for the Cezane APU Processors: https://download.gigabyte.com/FileList/Memory/mb_memory_b550-aorus-elite-v2_cezanne.pdf?v=2880da1b45... or on the RAM Manufacturer QVL LIST For your motherboard.
![Screenshot 2021-11-09 105732.png](/skins/images/4B306F17E81D171E95F8E456EB72CA91/responsive_peak/images/image_not_found.png)
The above image of the QVL LIST For RAM MEMORY For the Cezane is just a partial listing. It shows all the 4400Mhz RAM Modules that are compatible with the Motherboard and APU Processor.
The QVL LIST is fairly recent from 09/08/2021.