Sorry if someone said this already, but Paramount has the movie rights to Transformers, and so they'd probably have to sign off on something like this, too, if there was any signing off to be done.
GoBots? Not so much. Just Hasbro would likely do.
Given it's a "special" and not a movie, I'm not sure that would apply here. (It's basically a one-shot TV episode.)
Also given paramount has the rights to "Transformers"; that may not automatically include the rights to Gobots, especially given the legal weirdness Gobots finds itself in.