Are you using physical U2F keys for your Google or Amazon accounts? Cloudflare does support standard TOTP-based 2FA like most people use for Amazon and Google.

Are you using physical U2F keys for your Google or Amazon accounts? Cloudflare does support standard TOTP-based 2FA like most people use for Amazon and Google. So whether or not the lack of U2F support should matter depends on whether you actually use it elsewhere anyways.