Multiple Engagement Messenger modules can be created within the same instance to support different customer brands. You can find the step-by-step instructions to create Engagement Messenger Modules that include features and branding details here Setting up Engagement Messenger
However, the above documentation doesn't mention configuring the response headers to support multiple brands (different domains).
When you are configuring the HTTP Response Headers step (#5 step), you need to specify the multiple websites space delimited
If you want to set up chat/virtual agent capability within the EM module to support different brands, then you need to update the setting "com.glide.cs.embed.csp_frame_ancestors" to include the same websites/domains
Go to system properties (All -> sys_properties.list) and filter the results by *frame
Update the settings shown in the above screenshot with the values per your websites/domains
example value for com.glide.cs.embed.csp_frame_ancestors = 'self' https://*.abc.com/ https://*.xyz.com/ https://*.123.com/
Replace ABC, XYZ, and 123 with the domains you want to support
value for glide.set_x_frame_options = false
