This article describes how to modify the Zscaler GRE Tunnels destination datacenters.
Edit GRE Tunnels destination:
If you need to modify the destination datacenters associated with a GRE tunnel, you can do so in the Zscaler admin portal.
1. Log in to the Zscaler Admin Portal and select Network > Tunnels from the left navigation bar.
2. Find the tunnel for which you want to change the destination
Go to Cloudi-fi Admin Console Configuration Integration Zscaler Visit administration.

Go on your Zscaler tenant
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Go to Administration Static IPs & GRE Tunnels GRE tunnels Edit (the GRE tunnel concerned) Next.
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You will arrive to section 2 "DataCenter"

According to the source IP, Zscaler proposes a list of Datacenters for primary and secondary.
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Select the destination IPs according to the Datacenter you selected
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If you want to choose Datacenter that is not listed
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You can go to Zscaler Admin UI Administration Static IP & GRE.
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Edit your Static IP.
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While Editing it, when you are in the Regions section, Select “Manual” under the “Selection” Block and then Search and select the city you would like.
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Now you can save the changes and Go to GRE Tunnels.
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Now edit that Particular GRE tunnel mapped to your Static IP X.X.X.X.
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In the Data Centers section, new Data Centers will be accessible now (according to your previous changes). You can select it, then save and activate the changes.
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Synchronisation
This modification needs to be synchronised with the change of your GRE tunnels on your side.