I did indeed have an apache server running on port 80. When I visit http://pi.hole:8080/admin I get that the ip address refused to connect. (I have also tried by replacing pi.hole with the IP of my server of course.)
Please upload a debug log and post just the token URL that is generated after the log is uploaded by running the following command from the Pi-hole host terminal:
pihole -d
or if you run your Pi-hole as a Docker container:
docker exec -it <pihole-container-name-or-id> pihole -d
where you substitute <pihole-container-name-or-id> as required.
Hello @yubiuser!
Thank you so much for caring. I really appreciate it.
I was a slightly bad person last night... Being a bit desperate, in parallel to posting my question here I also created a new post (where I also learned to include the pihole -d token URL!), and I got help already.
sudo PIHOLE_SKIP_OS_CHECK=true pihole -r
did the trick, since FTL for some reason hadn't been updated and I had a mix of v6 and v5.
I really appreciate you taking the time to try to help me, and I wish you a wonderful weekend ahead! 
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