I got 401 from lemmy.world with the following response payload:

{
  "success": false,
  "error": {
    "code": 403,
    "message": "Posting & Uploading blocked from VPN/Tor"
  }
}

PS: yeah, I know it says it’s 403 in payload, but in response it’s 401

Yes, this is response payload it gives when hitting “Reply” or “Post” from certain VPNs:

{
  "success": false,
  "error": {
    "code": 403,
    "message": "Posting & Uploading blocked from VPN/Tor"
  }
}

I also use Proton VPN. Most issues were with DE servers I tried, multiple DE servers (like DE#526) didn’t work for me, but some others seem to be working. I also tried some other countries and they were working.

Sorry for a bit of off-topic, but for a note taking app I suggest checking out Amplenote (there is a free plan for browser and mobile apps). I discovered it recently and it’s quite a life changer for me. Proper tag system for notes is a killer feature.