Because I didn’t see it mentioned… Have you tried a browser other than Safari? Nothing generally against Safari but not all pages are WebKit or otherwise Safari-friendly.
The latest version of Firefox, for example, is compatible back to Sierra.
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I have tried Firefox, Chrome and Safari and I never get the splash page.
Library tried his ChromeBook and connected.
There was also some guy outside on the phone using the library Wi-Fi.
But I have been able to use my MBP's Wi-Fi at other spots, but the issue is that I want to use it HERE at this particular library!