As a first step to helping us to help you, please read this tutorial about installing and using MediaInfo to analyse one of your video files. Please post here the results of the Text view. Unfortunately, there could be various reasons why your files don't play and we really need rather more information about them!
Please also tell us exactly which version, edition and build of MEP you are currently running.
BDAV: 19.5 MiB, 7 s 813 ms
1 Video stream: AVC
19.8Mbs, 1920x1080 (16x9) at 25fps AVC(High@L4)(CABAC / Ref Frames)
Above is what is stated for first clip.
But note I have three sets of recordings from 3 different cameras used for latest event...all cameras used before with Magix Movie Edit Pro 2021. This is the first time of having an issue after updating to 2022 version?
We need ALL the details from the Options>Text view screen, please. Just copy and paste everything there to your next post.
Also, before updating to MEP 2022 (which edition btw, Basic, Plus or Premium) did you check the minimum requirements to run the software successfully and are you certain your computer more than meets them? The latest releases of both Movie Edit Pro and its "big brother" Video Pro X have made considerably increased demands on computer hardware with the introduction of the Infusion 3 engine. You can see my computer specs in my signature and I am finding various that VPX 13 (the latest release) is taxing my sytem pretty hard.
From your computer specs - the i5-6600 has 4 cores and no hyperthreading and is relying on the HD 530 integrated GPU.
If there is no other graphics card then the PC is just below the minimum of the system requirements for running MEP 2022 smoothly, as soon as you add effects, collages etc, playback will stutter.
We need the full MediaInfo data as to why the clips will not import.