I had same problem. which browser didn't allow you in Nextdoor? For me, it was Chrome, so I turned off blocker from that.
REVO luggage $100
More info
Promote your business here - Businesses get highlighted throughout the site and you can add a deal.
All of a sudden I can't open nextdoor.com messages (neither directly, nor respond). I get a pop-up telling me, that if I have a pop-up blocker, I must turn it off.
I have done this, and rebooted twice, yet the problem persists???