I don’t know if there is a solution for this. Microsoft has discontinued support for Internet Explorer so the seller portal will not allow uses to log in with that. Apparently the java library that GWS uses to connect to the Samsung Server has an IE component signature.
See this thread for some possible solutions
basically generate the Author and Distributor certificates using Tizen Studio
Use a command line tool to push your .tpk to your watch.
Good luck
Ron
Ron