Hi,
Do you have the issue using a profile without blacklist ?
If you get a SSL error, it can mean that a domain used by amazon app is in the Blacklist catategory and you should remove it.
In "Tools & Diagnostic -> Domain Check", Check if "fls-eu.amazon.es" or a CNAME target of the domain is in the Blacklist and remove it or move it in another category you will not use for the profile.
Even if the certificate is selfsigned or signed by LetsEncrypt, you will get a certificate error on domain fls-eu.amazon.es.
Do you have the issue using a profile without blacklist ?
If you get a SSL error, it can mean that a domain used by amazon app is in the Blacklist catategory and you should remove it.
In "Tools & Diagnostic -> Domain Check", Check if "fls-eu.amazon.es" or a CNAME target of the domain is in the Blacklist and remove it or move it in another category you will not use for the profile.
Even if the certificate is selfsigned or signed by LetsEncrypt, you will get a certificate error on domain fls-eu.amazon.es.