Is sogo package installed and sogo service running after OS upgrade?

Yes. Sogo works from the web application. It doesn't render events and tasks in Thunderbird but I can create new events in Thunderbird that show up in the sogo web application but not in Thunderbird.

I then upgraded to Ubuntu 22.04. Everything works from the web server. Email works in Thunderbird. Sogo calendars won't display in Thunderbird. Tasks and reminders also don't display. If I import the calendar as CalDev XML the calendar items display but the calendar is read-only. Even though I cannot see events on the calendar I am still able to add them and then see them from the sogo website.

This is not an easy install.

Email accounts are stored in PGSQL.

Running on NGinx.

I discovered php-fpm wouldn't start up. If was looking for a file. Unfortunately, I don't remember the name and I can't find the configuration any longer. It had something to do with the listening IP and port for php-fpm. I did get php-fpm to start but I suspect that the issue lies there.

At this point I've tried so many things that I don't remember everything I tried. I don't know where to go from here.

Can you guide me in the right direction? Are there configuration files I can send you for inspection?

As part of my troubleshooting I tried to install iRedMail on a debian VM to compare config files. I didn't find anything that looked significantly different.