My verification email isn't coming through

FINAL UPDATE: I have joined PieFed under the same username I used on Lemmy. Just commented on this post

UPDATE: I checked my mail and there were six verification emails. I clicked the latest one and it seems to have worked. So the email is working, but delayed somewhat.

EDIT: Some details

• The instance I'm trying to join is piefed.social
• The website is the same (https://piefed.social/auth)
• I am using a permanent email (not throwaway)
• I am not using a VPN

I tried to create an account, but my confirmation email isn't coming through no matter how much I click "resend" (and it shows "email sent" but it never seems to reach my mailbox). I checked the spam filter, mobile app, everything.

Is the instance verification down or something?