why can't I connect to my Redshift serverless database?

I've been trying for a few hours to connect to my Redshift serverless database - I'm following steps on this page:
https://docs.aws.amazon.com/redshift/latest/mgmt/serverless-connecting.html I'm trying to connect from DBeaver (jdbc) that I just downloaded two days ago with the latest drivers. The connection just times-out. Using DBeaver I am able to connect to my MySQL RDS database with no issues. For Redshift I did have to create a new VPC with 3 subnets as that is what Redshift requires. I've assigned a security group with the Redshift and Inbound IPv4 traffic on the Inbound Rule. I've also enabled the Turn on Publicly Accessible option on the serverless security page. Default namespace, default workgroup used - I copy the Endpoint from the workgroup page into DBeaver connection, when I Test Connection the jdbc format looks correct.
Just keeps timing out.