Issue Access permission issues after migration

[technique-web]

Hi,
My server was updated from plesk onyx to plesk 18.0.38, I'm running a wordpress network with 350 sites.
WordPress Toolkit displays this error message :

WordPress Toolkit was not able to properly access website files. This is most likely caused by a malware infection. It is strongly recommended to check this website for viruses and malware. If you have identified and fixed the underlying issue, click Refresh.
Path
/var/www/vhosts/MY_WP_DOMAIN.TLD/httpdocs

I made a hole scan, there is no malware in my wordpress installation.
It seems the imported user can't access the folder, how can I fix it ?

 

[weltonw]

Run a plesk repair and see if it's a permissions issue.

 

[technique-web]

Nothing happened after the repair

 

[IgorG]

Have you tried solution from this KB article: Wordpress Toolkit and Quarantine. How does it work? ?