EPEL & Codeready-builder AWS EC2 RHEL8

I am running an EC2 instance with a RHEL8 AMI.

I am looking to install R on the instance and I believe I need the EPEL package and to enable the codeready builder through the following two commands

sudo dnf install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpmsudo dnf config-manager --set-enabled rhui-codeready-builder-for-rhel-8-rhui-rpms

more info at (https://aws.amazon.com/premiumsupport/knowledge-center/ec2-enable-epel/)

I can download epel (first line) fine but when I run the second line I get the following:

This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.Error: No matching repo to modify: rhui-codeready-builder-for-rhel-8-rhui-rpms. 

Also when I try to run the following, I get the following:

This system has no repositories available through subscriptions.

and for completeness, this is the error when i try to install R

$sudo yum install -y RThis system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.Last metadata expiration check: 0:52:36 ago on Mon 04 May 2020 01:17:58 AM UTC.Error: Problem: package R-3.6.3-1.el8.x86_64 requires R-devel = 3.6.3-1.el8, but none of the providers can be installed  - package R-devel-3.6.3-1.el8.x86_64 requires R-core-devel = 3.6.3-1.el8, but none of the providers can be installed  - conflicting requests  - nothing provides openblas-devel needed by R-core-devel-3.6.3-1.el8.x86_64  - nothing provides texinfo-tex needed by R-core-devel-3.6.3-1.el8.x86_64(try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

Does anyone have any ideas or has solved this same problem?