So, I give this a try and attempted to reproduce the issue.

I set up a VM acting as the KDC, and configured sshd in it with the
following options:

GSSAPIAuthentication yes
GSSAPICleanupCredentials yes
GSSAPIKeyExchange yes

I then configured an LXD container to act as the krb5 client.  I created
a user "john" both in the KDC and in the client, then was able to verify
that kinit was working fine.  With that out of the way, I tried to
connect via ssh to the KDC:

$ ssh -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex -o
GSSAPIKeyExchange=yes krb5.test.lan

The connection worked.  I did the RH bug and tried to check if there was
anything else I could do, but apparently the bug should have manifested
with what I did.  I also tried to start sshd by hand using the options
you mentioned (plus "-o UsePam=yes"), to no avail.  So I'm a bit lost
here, and would also appreciate more info.

Thanks.

** Changed in: openssh (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1938144

Title:
  monitor_read: unpermitted request 48 on server while attempting GSSAPI
  key exchange

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