Synology DSM web interface with imported ssl key and cert from Cloudflare

In SYNDS723+ DSM web interface I set up DNS server with hq.mydomain.org. Then in the same DSM in security, certificates I imported SSL cert and key which I got from Cloudflare for mydomain.org. The cert has a wildcard for *.mydomain.org. In the same DSM after the certificate and key were imported I made this cert default cert, and assigned all services to use it. Then the web services were restarted. However, still getting not secure message when I access my SYNDS723+ DSM web interface with the address https://synds723.hq.mydomain.org from the LAN in the web browser.
Moreover, the cert and key works fine when I use it in other places like nginx
any suggestions how to get it set up properly?
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