PEC-SUB- 0002 error IP address
You will see this error when you log in to your Prolific account or when you try to accept a study on Prolific.
If your ISP uses dynamic IP addresses, the error may go away when your IP address changes.
If your ISP uses static IP addresses, you may have to instigate an IP address change.
Make sure you are not using a VPN or proxy when accessing Prolific. Also make sure you are not using any bandwidth sharing apps like Honeygain, which can get your IP address blacklisted and flagged.
Be aware that changing your IP address may change it to another IP address which is also flagged.
Things you can try:
Unplug your router for several hours, even overnight.
Reboot your router. This may take more than one time.
Contact your ISP and ask if they will change your IP address.
Use a hotspot.
If you are using a laptop or tablet, try using it at another location, such as a friends’ house. I advise against using public WiFi as those are more likely to be flagged.
If you are using a phone, turn WiFi off and use data.
If you are using a mobile device (laptop/tablet/phone) try restarting the device.
You can also try contacting the blacklist directly and submit a removal request.
One work around is to accept the study on your phone, then go to your laptop/desktop to complete the study.
Edit to add: On your phone, set it to Airplane Mode for a few minutes. That should get you a new IP address although that IP address may also be flagged.