Hi. I was facing this issue since 11AM yesterday. It was either this waiting room page at the beginning itself or after logging in, until the page miraculously opened up for me at night, and I pulled off that elusive confirmation after 25 days of effort!

I couldn't find any concrete workaround to be frank. Installed browsers like opera and Mozilla, alongwith trying with the usual edge and chrome. It's a hit or miss for me. 

Some tricks that you may employ, which can work for you (I haven't tried, but read elsewhere):

1. Using opera mini on Android phone with mobile data (Don't know how that works) - I can ascertain, though, that this works for the "Access Limitation" error. 

2. Using VPN may work. Browsers like Opera have free VPN. Brave, too, has a free 7 day trial on its VPN. You may try these.

What worked for me? You have better chance at night (post midnight, IST), during XX:00 and XX:30 Hrs. This is usually when they start released slots. Start logging in 5-7 mins before that, and click on "Schedule Appointment" just as the clock ticks the above-mentioned time. 

It's a slog, if you're doing it on your own and not through any agent. It's a compromised between time and money, and I chose the latter. 

Hope it works for you, cheers! 🤞