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Can't authenticate Outlook email due to suspected webpage issue

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When trying to add my Outlook account, I am stuck at the authentication step. The webpage doesn't work. The screen recording I've attached is what happens on the second time and later; the first time it shows a different page (saying "The app named Thunderbird will be granted these permissions [... a list of permissions]; allow?" and I clicked "Allow") but it doesn't work either.

There is a "在 浏览器 浏览器中打开" option ("Open in browser browser" haha; it refers to Xiaomi system browser") but it opens a "Cannot find this page" error page. The "在 Edge 中运行" ("Run in Edge") button is unclickable.

Translation of the screen recording: Trying to log in to Thunderbird Android? Only continue if downloaded the app from trusted app store or website. [Cancel/Continue]

Screen recording at https://wwblo.lanzoub.com/itYge3mz8rlc (extract code: cnme)

When trying to add my Outlook account, I am stuck at the authentication step. The webpage doesn't work. The screen recording I've attached is what happens on the second time and later; the first time it shows a different page (saying "The app named Thunderbird will be granted these permissions [... a list of permissions]; allow?" and I clicked "Allow") but it doesn't work either. There is a "在 浏览器 浏览器中打开" option ("Open in browser browser" haha; it refers to Xiaomi system browser") but it opens a "Cannot find this page" error page. The "在 Edge 中运行" ("Run in Edge") button is unclickable. Translation of the screen recording: Trying to log in to Thunderbird Android? Only continue if downloaded the app from trusted app store or website. [Cancel/Continue] Screen recording at https://wwblo.lanzoub.com/itYge3mz8rlc (extract code: cnme)
Attached screenshots

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