The SharePoint Add-In model in SharePoint Online has been retired as of November 27th 2023. Microsoft will be retiring the SharePoint Add-In extensibility model over the following timeline:
- SharePoint Add-Ins will stop working for new tenants as of November 1st, 2024
- SharePoint Add-Ins will stop working for existing tenants and will be fully retired as of April 2nd, 2026
This applies to all environments including Government Clouds and Department of Defense. For more details, visit:
- BLOG: SharePoint Add-In retirement in Microsoft 365
https://aka.ms/retirement/addins/update - ARTICLE: SharePoint Add-In retirement in Microsoft 365
https://aka.ms/retirement/addins/support - Modernization guidance for existing SharePoint Add-In model implementations in Microsoft 365
https://aka.ms/retirement/addins/guidance - Frequently Asked Questions
https://aka.ms/retirement/addins/faq
kurtsh
Kurt Shintaku's Blog 
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