If you’re seeing this error message, it’s most likely because your device doesn’t meet the requirements to play on the web. You can review them here: https://scopely.helpshift.com/hc/en/46-marvel-strike-force/faq/8582-requirements-to-play-on-the-web/

However, if your device meets the requirements, the error message appears as if you don’t have enough RAM, and you’re using Brave Shield, it's because Brave Shield’s fingerprint blocking feature interferes with our ability to determine your browser’s available RAM.

• To fix it, please try this:
  Go to the Marvel Strike Force web play site, open Brave Shield settings, and disable “Fingerprinting” specifically for MarvelStrikeForce.com.