Docker Vaultwarden behind VPN

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Docker Vaultwarden behind VPN

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I have installed Vaultwarden via Docker.
All clients are refusing to connect. It looks to be due to the self-signed certificate.
I do not want to expose any additional ports to WAN (e.g., port fortwarding, reverse proxy) to fulfill the certificate requirements.
(I access my LAN when outside exclusively via OpenVPN on a router.)
Any elegant suggestions for how to solve?

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