No, unfortunately. I still don't believe there is a way to add or customize a user agent for requests, although I have not tried to do it again on the latest versions of Router OS.I'm in the same boat and get the same error, did you manage to find a fix for this?
Do you mind sharing your final full config for NAT rules? I am trying to get this working and am having similar issues as you originally described.Yup, masquarade for bridge to local subnet in src-chain did the trick. Thank you all.