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For the development version, please use Trusted Application OR Basic Authentication mode. The oAuth mode has a bug in the development current version [RPC-12].
However, in the long term, we would recommend use of OAuth authentication for AppLinks Configuration. Other methods may not be supported in future. Please refer below link for detailed information : https://confluence.atlassian.com/display/DOC/Configuring+OAuth+Authentication+for+an+Application+Link
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