Scan Failed

Hello,
i have wordfence installed on siteground hosting, with actual wp version etc, but i don’t get the scans working.

I have already done the troubleshooting steps here:

https://www.wordfence.com/help/scan/troubleshooting/#if-your-scans-arent-starting

I use in my htaccess wp-login protection, excluded there the wordfence servers as well:

# Protect wp-login.php 
<FilesMatch "^(wp-login\.php|wp-config\.php|php\.ini|php5\.ini|readme\.html|bb-config\.php)">
<IfModule mod_authz_core.c>
Require all denied
Require ip 44.239.130.172
Require ip 44.238.191.15
Require ip 35.155.126.231
Require ip 54.68.32.247
Require ip 44.235.211.232
Require ip 54.71.203.174
</IfModule>

<IfModule !mod_authz_core.c>
<IfModule mod_access_compat.c>
Order Allow,Deny
Deny from all
Allow from 44.239.130.172
Allow from 44.238.191.15
Allow from 35.155.126.231
Allow from 54.68.32.247
Allow from 44.235.211.232
Allow from 54.71.203.174
</IfModule>
</IfModule>
</FilesMatch>

Even if i deactivate the additional htaccess protection code and restart the scan, the scan fail.

Any Idea how to fix?
Thx
best regards
Sally