Route10 LAN settings cannot enter IPv6 DNS address

I’m currently using DOH with ad blocking on a local server. When I attempt to add that device’s IPv6 address on the LAN I receive an error message.

What error do you get?

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The route10 would throw an error message when I attempted to save the configuration

What does that error message say?

Although truncated in the image this is a valid ipv6 DNS address