SSL Errors Using Google Managed (Let's Encrypt) Certs

We have a business account domain and unless we disable proxy on the A record, the GCP load balancers set up with Google managed certs do not work. How can we resolve this problem?

Which error? Which URL? And post screenshots.

Failed to load resource: net::ERR_SSL_VERSION_OR_CIPHER_MISMATCH

We’ve currently got proxy disabled so it’s working, but the url is

That will be Subdomain too deep