Hi,
the error indicates that the host FT-HV01.ft.local from where you are converting from is serving an incomplete certificate chain (missing issuing and / or root CA). You will have to replace the certificate on the host with a full chain one to get it working in stock configuration.
Otherwise, you could try this KB Disabling SSL encryption on VMware Converter Standalone 5.x and 6.0 (2020517) - although I'm unsure if this "fix" is still viable, as it is only intended for VMware Converter up to version 6.0. This also may increase performance, but will transfer your conversion data unencrypted, which may be a security risk.
Regards,
Lukas
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VCIX-NV + VCIX-DCV 2023
Please mark resolved issues as such. Kudos are appreciated.