“We could not secure your device for the current domain. Please make sure that you are on the correct domain to mitigate phishing attacks.”
If you are getting the above error message running your Stripe Crypto onramp App, then check out the registered domains inside your Stripe dashboard here: https://dashboard.stripe.com/crypto-onramp/allowlist-domains
This information was not found on the Stripe Docs afaik. So here you have it, if you get this error, check out your domains.