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This migration documentation applies only if you are using SharePoint OnPrem version in case that and if you already have configured the SharePoint URL. The SharePoint Online version is not affected |
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Yes, your app will still continue working because your URL is already stored in the configuration but it just won’t show. Even thought though the app will still continue working it is a good practice to update the configuration to have a consistent state for the app.
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For more info on how to do this, follow the steps on in the guide https://communardo-products.atlassian.net/wiki/spaces/SPONLINE/pages/148669749/Configure+the+Confluence+App+for+SharePoint+On-Premises+Latest+Server+DC