• Describe the issue
  Users with pam.i686 installed in Fedora 36 are unable to perform dnf upgrade.
  In the fedora repository, there are both x86_64 and i686 for pam-1.5.2-12.fc36,
  but in updates, there is only x86_64 for pam-1.5.2-13.fc36.

See rhbz#2124059 for exact error messages and further discussion.
There, @sharkcz suggests that this situation is a releng issue, so reporting it here.

• When do you need this? (YYYY/MM/DD)
  Not urgent.

• When is this no longer needed or useful? (YYYY/MM/DD)
  When Fedora 36 goes end-of-life.

• If we cannot complete your request, what is the impact?
  Affected users have to uninstall pam.i686,
  or figure out how to download and install it from Koji.