Ensure that the account used to connect to the SharePoint Online App Catalog does NOT use multi-factor authentication. If you upload the SharePoint Online Connector App Package using multi-factor authentication, the upload will fail.
The installer, which deploys the app package, needs to be run from a machine where TLS 1.2 is enabled.
To install the SharePoint Online Connector to a specific SharePoint Web, you need to upload the App Package to the SharePoint Online App Catalog, which makes it available to the Web for installation.
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To upload the SharePoint Online Connector App Package, enter the necessary deployment settings, and then click Next.
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Connector Web URL: The URL to the SharePoint Online Connector Web
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App Catalog URL: The URL to the SharePoint Online App Catalog
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Client ID: The Client ID that was generated during section 5.1.1
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SharePoint Online Username: Used to connect to SharePoint Online
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SharePoint Online Password: Used to connect to SharePoint Online
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Click Next. The App Package will be uploaded to the SharePoint Online App Catalog you specified above.