HTTPS forwarding to another FQDN

Hallo all,

I have the following problem

I have created an LTM distribution with SSL Offloading

the V-Server listens to the FQDN nexcloud.xy.de

The distribution takes place on a Nexcloud server

This has the FQDN nexcloud-vb.zb.de

If I now call nexcloud.xy.de in my browser I get a redirection from the server back with nexcloud-vb.zb.de/index

How can I make the FQDN for the browser always stay nexcloud.xy.de