Can't access my account (no "magic link" email, tried 3 times, waited half an hour, confirmed not in Spam, confirmed other emails are arriving)

I'm currently unable to access my Room Visualizer AI account because no "magic link" email is being sent when I go through the login process.

I’ve tried 3 times. Twice separated by only a few minutes waiting, and then again shortly before logging this report in case it had been fixed in the meantime.

I waited over half an hour after the first 2 attempts in case the email was just delayed from the usual few-seconds response time.

I have checked my Spam folder using my ISP's email web interface to check at the earliest possible stage, and there was no sign of the magic link email. (I have the address pattern whitelisted with my ISP so I didn't expect it to go into Spam, but wanted to check anyway in case the sending address had changed.)

I have confirmed that other emails are arriving (various third party emails received while waiting for the magic link email/s, as well as a test I sent from my Gmail account), so it's not a problem with receiving emails generally.

Additional info is that I had a logged-in session established several days ago, but when I tried to add a room to test the new Project Dashboard I got an "Error. Failed to fetch". So I did the usual troubleshooting thing of logging out, clearing my browser cache, and attempting to relog, but I've been unable to do so.