Issue Client denied by server configuration evasive20:error

[Philipp MQ]

I installed a new typo3 10lts via composer linux plesk obsidian 18.0.27 and ubuntu 16lts.

When trying to access the page module, I get such errors in the error_log:

evasive20:error pid 5442 client denied by server configuration: /var/www/vhosts/domain/httpdocs/test-composer/public/typo3/index.php, referer: /typo3/index.php?route=%2Fmain&token=df1d870594fbb7e7a90csdf69esdf0af6f97sdf9b
evasive20:error pid 5442 client denied by server configuration: /var/www/vhosts/domain/httpdocs/test-composer/public/typo3/sysext/core/Resources/Public/Icons/T3Icons/actions/actions-filter.svg, referer: /typo3/index.php?route=%2Fmain&token=df1d870594fbb7e7a90csdf69esdf0af6f97sdf9b
evasive20:error pid 5442 client denied by server configuration: /var/www/vhosts/domain/httpdocs/test-composer/public/typo3/sysext/core/Resources/Public/Icons/T3Icons/actions/actions-refresh.svg, referer: /typo3/index.php?route=%2Fmain&token=df1d870594fbb7e7a90csdf69esdf0af6f97sdf9b
evasive20:error pid 1868 client denied by server configuration: /var/www/vhosts/domain/httpdocs/test-composer/public/typo3/index.php, referer: /typo3/index.php?route=%2Fmain&token=df1d870594fbb7e7a90csdf69esdf0af6f97sdf9b

... the browser freezes and the my IP gets thrown in fail2boan.

On the same server I have another test domain with the same php settings and installed TYPO3 via plesk, there everything is working ... yet they have an old 8.7LTS.

Also when trying to install the introduction package, I get tis error:

evasive20:error pid 26284 client IP:45854 client denied by server configuration: /var/www/vhosts/domain/httpdocs/test-composer/typo3/install.php, referer: /typo3/install.php?install[controller]=environment&install[context]=backend

How can I solve this and what do I need to do (step-by-step)? php 7.3 apache 4.2