Ssl access docker synology nas

Hi All

I’m a newbee in HA.
I have already searched on the net and the forum but no answer.

I have installed HA on my SYNOLOGY NAS.

All is working when I access it via IP adress like 192.x.x.x:8123
I have also configured a reverse proxy in HTTPS mode. I can access the login page using an address like https://hass.xxxx.xxx But when I want to login I have an error

I have a Let’sEncrypt Certificate installed for the whole NAS.

Does anybody know how to solve my problem

Thanks.

D.