I can't find any reference to this in the docs.
The error passed to the deepLinkHandler callback is:
Error Domain=io.branch Code=1004 "{
code = 400;
message = "Invalid identity_id";
}" UserInfo={NSLocalizedDescription={
code = 400;
message = "Invalid identity_id";
}}
I'm not sure what this means and why branch isn't picking up the details about the install link clicked as is intended.