Your web server is not properly set up to resolve "/.well-known/webfinger"
(desgleichen für nodeinfo, caldav und carddav.)
In deren Forum gibt es dieses Problem mehrfach, die Diskussion wird dort aber immer abgewürgt mit einem Verweis auf die Dokumentation.
Es heißt in der Doku, man solle
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<IfModule mod_rewrite.c>
RewriteEngine on
RewriteRule ^/\.well-known/carddav /nextcloud/remote.php/dav [R=301,L]
RewriteRule ^/\.well-known/caldav /nextcloud/remote.php/dav [R=301,L]
RewriteRule ^/\.well-known/webfinger /nextcloud/index.php/.well-known/webfinger [R=301,L]
RewriteRule ^/\.well-known/nodeinfo /nextcloud/index.php/.well-known/nodeinfo [R=301,L]
</IfModule>
Die Apache Dokumentation beschreibt noch, daß man
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AllowOverride All
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systemctl restart apache2
Soweit ich das bisher nachvollziehen konnte, sollte die WebURL
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http://MeinServerName/.well-known/webfinger
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http://MeinServerName/nextcloud/index.php/.well-known/webfinger
Um dem ganzen auf die Schliche zu kommen, habe ich das LogLevel in apache2-conf hochgesetzt und bekomme folgende Ausgabe:
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[Wed May 10 11:24:35.831487 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] add path info postfix: /var/www/html/.well-known -> /var/www/html/.well-known/webfinger
[Wed May 10 11:24:35.831600 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] strip per-dir prefix: /var/www/html/.well-known/webfinger -> .well-known/webfinger
[Wed May 10 11:24:35.831701 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] applying pattern '^/\\.well-known/carddav' to uri '.well-known/webfinger'
[Wed May 10 11:24:35.831800 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] add path info postfix: /var/www/html/.well-known -> /var/www/html/.well-known/webfinger
[Wed May 10 11:24:35.831900 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] strip per-dir prefix: /var/www/html/.well-known/webfinger -> .well-known/webfinger
[Wed May 10 11:24:35.832041 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] applying pattern '^/\\.well-known/caldav' to uri '.well-known/webfinger'
[Wed May 10 11:24:35.832265 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] add path info postfix: /var/www/html/.well-known -> /var/www/html/.well-known/webfinger
[Wed May 10 11:24:35.832457 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] strip per-dir prefix: /var/www/html/.well-known/webfinger -> .well-known/webfinger
[Wed May 10 11:24:35.832558 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] applying pattern '^/\\.well-known/webfinger' to uri '.well-known/webfinger'
[Wed May 10 11:24:35.832657 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] add path info postfix: /var/www/html/.well-known -> /var/www/html/.well-known/webfinger
[Wed May 10 11:24:35.832757 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] strip per-dir prefix: /var/www/html/.well-known/webfinger -> .well-known/webfinger
[Wed May 10 11:24:35.832892 2023] [rewrite:trace3] [pid 6342] mod_rewrite.c(493): [client 192.168.31.1:47638] 192.168.31.1 - - [MeinSeverName/sid#7f9daabfd8e8][rid#7f9da39540a0/initial] [perdir /var/www/html/] applying pattern '^/\\.well-known/nodeinfo' to uri '.well-known/webfinger'
[Wed May 10 11:24:35.833153 2023] [core:info] [pid 6342] [client 192.168.31.1:47638] AH00128: File does not exist: /var/www/html/.well-known/webfinger
Das ganze läuft im Moment nicht von aussen erreichbar in meinem Heimnetz. Der Einfachheit halber also auch erstmal provisorisch via HTTP statt HTTPS.