I've recently endured a similar problem and see from your log that you had the same pam closing session / greeter stopped symptoms in the journalctl log. I came upon a workaround suggested in github sddm issue #1443:
loginctl enable-linger
Using this prevents pam from closing out and sddm will allow me to login in correctly. Hopefully this works for you or anyone else with a similar issue.
loginctl enable-linger
Using this prevents pam from closing out and sddm will allow me to login in correctly. Hopefully this works for you or anyone else with a similar issue.
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