CentOS Stream release 8 convert2rhel failed

Hi,
I am trying to convert Centos to RHEL 8 by following https://access.redhat.com/articles/2360841 & https://www.redhat.com/en/blog/introduction-convert2rhel-now-officially-supported-convert-rhel-systems-rhel &
and on executing this command, I am getting error:

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[02/16/2023 05:57:47] TASK - [Prepare: Gather system information] *******************************
CRITICAL - Couldn't get system version from /etc/system-release
Writing breadcrumbs to '/etc/migration-results'.
Writing RHSM custom facts to '/etc/rhsm/facts/convert2rhel.facts'.
No changes were made to the system.
[root@pg2 ~]# convert2rhel --username rajatjpatel@gmail.com^C^C
[root@pg2 ~]# grep . /etc/*-release
/etc/centos-release:CentOS Stream release 8
/etc/os-release:NAME="CentOS Stream"
/etc/os-release:VERSION="8"
/etc/os-release:ID="centos"
/etc/os-release:ID_LIKE="rhel fedora"
/etc/os-release:VERSION_ID="8"
/etc/os-release:PLATFORM_ID="platform:el8"
/etc/os-release:PRETTY_NAME="CentOS Stream 8"
/etc/os-release:ANSI_COLOR="0;31"
/etc/os-release:CPE_NAME="cpe:/o:centos:centos:8"
/etc/os-release:HOME_URL="https://centos.org/"
/etc/os-release:BUG_REPORT_URL="https://bugzilla.redhat.com/"
/etc/os-release:REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux 8"
/etc/os-release:REDHAT_SUPPORT_PRODUCT_VERSION="CentOS Stream"
/etc/redhat-release:CentOS Stream release 8
/etc/system-release:CentOS Stream release 8
[root@pg2 ~]# uname -a
Linux pg2 4.18.0-448.el8.x86_64 #1 SMP Wed Jan 18 15:02:46 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

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