Airable 403 Forbidden – Can’t log in

After a one-hour power failure, all my BluOS devices booted up correctly and Idagio remained logged-in, but Airable is logged-out.

Trying to log in through the BluOS desktop app leads to a blank screen, with only the ← (left arrow) in the corner.

In the mobile app, it also leads to a mostly empty screen, with only the green Android logo (as described in this post from six months ago), but that screen actually contains this text in black font on a black background, which can be made visible by selecting it (i.e. long-press / Select all):

Web page not available

The web page at http:/192.168.0.104/credentials could not be loaded because:

net::ERR_HTTP_RESPONSE_CODE_FAILURE

 

My DNS log shows that access to 7818664144.airable.io was successful.

What should I do?