Happened to me. Solution on iOS is to to go Settings, Safari (or whatever is your defaut Browser) , and disable the Content Blocker on the browser.
That will allow login to the app. Once this was done you may be able to reactivate the Content blocker.
This is still terrible coding and should not fail in this manner with no workaround for a non captcha validation like faceID or authenticator app.
They are trying to block out robots, but they aren’t very good at it.
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