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I can't add/modify port forwarding rules, get "Failure! Please check your inputs."

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I can't add/modify port forwarding rules, get "Failure! Please check your inputs."

So when I try to add or modify a port forwaring rule in my xfinity wireless gateway (TG1682G) I get the unhelpfull error "Failure! Please check your inputs." . My inputs are fine, and I even get it if i click on edit on a rule, and hit save without changing anything. I have tried on Chrome and Edge browsers. I saw a previous answer on a similar problem from 5 years ago, and it had the unhelpful solution of resetting the gateway to factory settings, but I don't want to do that in the case it doesn't actually help and makes me have to go through the process of adding all the settings again. Any ideas?  Is this the latest gateway that Xfinity has available?