ISPConfig module issue & error message

[cluster]

Debian 11
PHP 7.4
Blesta 5.70
ISPConfig 3.2.10p1

1. On package activation - > Error message: web_php_options_notempty<br /> ssh_chroot_notempty<br />
I have no idea why this error occurs, selected in package a template (package) of the ISPConfig server which was shown in Blesta package setup

2. I have allowed to use a domain name as username in ISPConfig, but this is blocked (regex check) in Blesta (domain.tld) contains a dot.
Can this problem be solved by a extended regex?

need some help to solve these problems