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Description of problem:
Connection to container with systemd-nspawn -U fails on rhel8.4

Version-Release number of selected component (if applicable):
systemd-239-44.el8.x86_64
systemd-container-239-44.el8.x86_64

How reproducible:
always


Steps to Reproduce:
yum install mock
mock --rootdir /var/lib/machines/test --init
cd /var/lib/machines/test/
systemd-nspawn  -U

Actual results:
Spawning container test on /var/lib/machines/test
Press ^] three times within 1s to kill container.
Selected user namespace base 202244096 and range 65536.
Failed to mount cgroup on /sys/fs/cgroup/memory (MS_NOSUID|MS_NODEV|MS_NOEXEC "memory"): Operation not permitted
Child died too early.

Expected results: 
Spawning container test on /var/lib/machines/test.
Press ^] three times within 1s to kill container.
Selected user namespace base 202244096 and range 65536.



Additional info:

*** Bug 1935751 has been marked as a duplicate of this bug. ***

found during verification of 
https://bugzilla.redhat.com/show_bug.cgi?id=1906833
https://bugzilla.redhat.com/show_bug.cgi?id=1912155

*** This bug has been marked as a duplicate of bug 1913806 ***