The domain I want to register via Netlify is available but already managed by another team (my old account)

Hi @gasserkl,

Thanks for following up.

You’ll want to configure the External DNS configuration like so:

For klausgasser.com, create an A Record at your registrar that points to 75.2.60.5.

For the www subdomain, create a CNAME Record at your registrar that points to klausgasser.netlify.app.

Could you give that a try and let us know if you continue to have issues?