There's a hotel I have to stay in a lot for work and their wifi has a similar page. The entry boxes show up but the button almost never shows up in the first load.
There's no reliable way of getting it to show the button so I try many things, of which one will eventually work. They are - trying to go to another website like gmail or another bookmark, refreshing the page, going to the address of the login page itself (from what it shows on a PC), closing and reopening the browser.
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