Hi
I work in the Hotel industry in the front desk of a hotel. Now is it that you do not see the hotel's wifi's name when you go to the wifi dropdown menu? If it is and it says connected but the web browser is still not working and there portal is not coming up try putting the hotel's website URL into the search box at the top of the browser. I know at the hotel I work at. If you try to connect to our wifi network and our portal does not come up if you put our hotels website in to the search box in the web browser it forces our portal to come up. From there you put the password there and there you are connected to the internet. Try that.
Also see if the front desk has a 1800 number you can call for help. Our hotel has that. When the guest calls the 1800 number it contacts the people that are incharge of our servers and they do what is call whitelist the person's device by putting it on our network without having to go through the portal or having to put in the password.
Give both of those a try and see what happens
Good luck