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The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I think you are using Steam Flatpak, right? In which case, you're hitting this bug. These games use Microsoft's Media Foundations, and the videos can't play because the proprietary codecs are missing.
You can currently play the games by using upstream GE-Proton. Install according to the instructions in the repository: https://github.com/GloriousEggroll/proton-ge-custom. Basically, extract it in the folder ~/.var/app/com.valvesoftware.Steam/data/Steam/compatibilitytools.d/.
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Hence, a higher number means a more popular project.