Hi Stef, yes, I solved the problem. I edited the .htaccess file to whitelist Facebook crawlers
# Whitelist Web Bots
SetEnvIfNoCase User-Agent facebookexternalhit/1.1 Whitelist
SetEnvIfNoCase User-Agent meta-externalagent/1.1 WhitelistSetEnvIfNoCase User-Agent ^-?$ Whitelist