Is the sophos central management not ready yet for 17.5?

Seems to me too.

If you want user sync you need to activate EDR beta program and install the beta Enpoint software on the pcs.

Just found this confirming that Sophos Central isn't ready for 17.5 yet:

https://community.sophos.com/products/xg-firewall/sophos-xg-beta-programs/central-management-eap/f/feedback-and-ideas/109352/stay-tuned-for-the-launch-of-the-public-eap-for-firewall-management-in-sophos-central

Just found this confirming that Sophos Central isn't ready for 17.5 yet:

https://community.sophos.com/products/xg-firewall/sophos-xg-beta-programs/central-management-eap/f/feedback-and-ideas/109352/stay-tuned-for-the-launch-of-the-public-eap-for-firewall-management-in-sophos-central