Problem after updating Server - no configuration option

I recently upgraded an older Debian Server from 9 to 11, including Icinga.
Since I would like to have graphite, I installed that too.

Now, I don’t have the “configuration” option anywhere in the web frontend.
Icinga itself works and still handling some checks, but I only have blank graphs and furthermore I can not configure anything in the web.
What I am missing here?
Is there any file configuration I need to check?

My dashboard looks like this:

I followed the instructions for installing graphite here:
https://icinga.com/docs/icinga-web-graphite-integration/latest/doc/01-About/

And I can’t proceed when it comes to “Configuration”.

I installed everything from official repository (Index of /debian icinga-bullseye main) and these are the installed versions:

icinga-director/icinga-bullseye,now 1.11.1-2+debian11 all [installed]
icinga-director-daemon/icinga-bullseye,now 1.11.1-2+debian11 all [installed,automatic]
icinga-director-php/icinga-bullseye,now 1.11.1-2+debian11 all [installed,automatic]
icinga-director-web/icinga-bullseye,now 1.11.1-2+debian11 all [installed,automatic]
icinga-graphite/icinga-bullseye,now 1.2.4-1+debian11 all [installed]
icinga-graphite-web/icinga-bullseye,now 1.2.4-1+debian11 all [installed,automatic]
icinga-l10n/icinga-bullseye,now 1.3.0-1+debian11 all [installed,automatic]
icinga-php-incubator/icinga-bullseye,now 0.22.0-1+debian11 all [installed,automatic]
icinga-php-library/icinga-bullseye,now 0.13.2-1+debian11 all [installed,automatic]
icinga-php-thirdparty/icinga-bullseye,now 0.12.1-1+debian11 all [installed,automatic]
icinga2/icinga-bullseye,now 2.14.2-1+debian11 amd64 [installed]
icinga2-bin/icinga-bullseye,now 2.14.2-1+debian11 amd64 [installed,automatic]
icinga2-common/icinga-bullseye,now 2.14.2-1+debian11 all [installed,automatic]
icinga2-ido-mysql/icinga-bullseye,now 2.14.2-1+debian11 amd64 [installed]
icingacli/icinga-bullseye,now 2.12.1-1+debian11 all [installed]
icingaweb2/icinga-bullseye,now 2.12.1-1+debian11 all [installed]
icingaweb2-common/icinga-bullseye,now 2.12.1-1+debian11 all [installed,automatic]
monitoring-plugins/oldstable,oldstable,now 2.3.1-1 all [installed]
monitoring-plugins-basic/oldstable,oldstable,now 2.3.1-1 amd64 [installed,automatic]
monitoring-plugins-common/oldstable,oldstable,now 2.3.1-1 amd64 [installed,automatic]
monitoring-plugins-standard/oldstable,oldstable,now 2.3.1-1 amd64 [installed,automatic]
php-icinga/icinga-bullseye,now 2.12.1-1+debian11 all [installed,automatic]
vim-icinga2/icinga-bullseye,now 2.14.2-1+debian11 all [installed]

Any help would be really appreciated here