Login no longer working on Synology NAS

Hi,

It seems I can’t login anymore from the Synology Tailscale app. When I open the app, I get redirected to a login page with an url of the form http://nas:5000/webman/3rdparty/Tailscale/?SynoToken=xxxxxx). There is a blue login button on the button, but nothing happens when I click on it.

I think the problem started after I upgraded to DSM 7.1-42661 Update 4 (but I’m not 100% sure).

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Reinstalling the app does not solve the issue btw.

I checked in Google Chrome, and a request is generated:

However, no response is received.

I had luck following the instructions in this thread: Unable to add my Synology NAS - #13 by TimA, specifically the portion describing how to manually authenticate via the command line using sudo tailscale up.