Certificate issue

I have an ftps connection setup with a self-signed certificate from the server.

The certificate is saved (I checked the registry) and the GUI connects without asking whether the site is trusted.

My automation script keeps asking whether the site is trusted and the log file says:
"Certificate failed to verify against Windows certificate store: Error: 800B0109, Chain index: 0, Element index: 0"

I have tried scripting the key, still the same error is received. I've also tried -certificate="*" to no avail.

How can I get the script to run without user intervention (full automation)?

Thanks in advance!

Show us a full session log file from GUI and the script (both with and without the -certificate=*).