You can use Authy to share 2FA access to a single Cloudflare account. Information on this is available here:
If you share a Cloudflare account between multiple team members we recommend using Authy's multi-device feature.
This will allow each member of your team to have access to the 2FA token needed to log in to the account.
We do now have a better solution for multi-user access for a single Cloudflare accounts for our self-serve customers. Single Account Access.
You can learn more about that here: