Convert from CentOS 8 to RHEL 8: Error of repomd.xml

Hi,

I am converting from CentOS 8 to RHEL 8. I am following this https://access.redhat.com/articles/2360841
One of the steps requires RHEL packages access through custom repositories configured in the /etc/yum.repos.d/
So I have downloaded ISO image rhel-8.3-x86_64-dvd.iso and mounted it through the following command:
mount -o loop rhel-8.3-x86_64-dvd.iso /media/rhel8dvd

Then create a repo file /etc/yum.repos.d/myredhat.repo with text:
[repository]
name=myredhatiso
baseurl=file:///media/rhel8dvd
enabled=1

But on executing yum clean all and then yum update, I am getting the following error:
myredhatiso 0.0 B/s | 0 B 00:00

Errors during downloading metadata for repository 'repository':
- Curl error (37): Couldn't read a file:// file for file:///media/rhel8dvd/repodata/repomd.xml [Couldn't open file /media/rhel8dvd/repodata/repomd.xml]
Error: Failed to download metadata for repo 'repository': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried

I don't have a repomd.xml file in the mounted ISO.
How can I resolve this issue.
Thanks