Tunnel to my NAS Service with OTP Access Policy works on PC but not on Mobile Phone

I setup a tunnel to my Synology NAS self hosted Vaultwarden service on Docker. I added a One Time Pin access policy that sends me an email with the PIN. This works fine on my PC but does not give me the prompt to enter the PIN on my phone… the phone app response is: “We were unable to process your request, try again or contact us”

Any ideas on how to get this to work on the phone app? Thanks

The phone app is Bitwarden