Cannot sync with libaray on Synology NAS

edited November 27, 2021
Error showing

"Zotero could not make a secure connection.api.zotero.org uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown.
The server might not be sending the appropriate intermediate certificates.
An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER"

Any clues
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