Trying to set up new ipad (A16) but getting server error everytime. Can anyone help please?

These support pages should get you started with setup of your new iPad - and the methods of transferring your data from old to new iPad:

Set up your iPhone, iPad or iPod touch – Apple Support

Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support

Use Quick Start to transfer data to a new iPhone, iPad or iPod touch – Apple Support

If the donor iPad, from which you are transferring your data precedes iOS12.4, QuickStart will not be available.

“Transfer” is rather a misnomer. In reality, your data and setup is merely cloned to the new device. Nothing is moved or removed from the original device.

An alternative is to restore either an iCloud or iTunes backup to the new device:

How to back up your iPhone, iPad and iPod touch – Apple Support

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

This would suggest that your internet connection may be the issue - as connection to Apple's back-end servers may be being unexpectedly blocked.

You may find that a restart of your WiFi Router, followed by a restart of your iPad will clear the problem. To restart your router, disconnect power from the router for at least 30 seconds - then reconnect power to restart. After your router reboots (which may take several minutes), force restart your iPad.

Otherwise, try setting-up and activating your iPad using a different internet connection. Perhaps a helpful friend or neighbour will be able to help? Otherwise, a visit to the visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be delighted to offer assistance:

Genius Bar Reservation and Apple Support Options - Apple