Hi!
If you have to import APP in Dynamics Customer Engagment v9.0 and will find this error "0x80040203 Expected non-empty string. Parameter name: SiteMapName" is because when you exported your solution in the customizations.xml is missing the node XML <SiteMapName> after every SiteMapUniqueName in the AppModuleSiteMap.
You have to add this node in every AppModuleSiteMap.
This is an example:
<AppModuleSiteMaps>
<AppModuleSiteMap>
<SiteMapUniqueName>bd3c391f1a7c48818b7841cb8dc9a1cc</SiteMapUniqueName>
<SiteMapName>Dynamics 365 Mobile – personalizzato</SiteMapName> NODE TO ADD!!
Hope this is useful for someone :)
Alberto
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