Microsoft announced retirement for SharePoint Add-Ins and ASC-based app permissions (SharePoint app-only principals). Let me summarize here:

• SharePoint Add-Ins, ASC-based app permissions and SharePoint app-only principals
• Timeline of retirement and future plans
• How to detect if there are legacy service principals used in the environment
• Migration guidance

Timeline

Known key retirement milestone dates:

• Mar 2024 – Microsoft will stop accepting new Add-In submission to app store
• Jul 2024 – Microsoft will stop ability for customers to acquire add-ins from App Store (*)
• using ACS and Add-ins will be blocked for new tenants since Nov 2024
• using ACS and Add-ins will be blocked for all tenants since Apr 2026

(*) SPFx based solutions will continue to be available

So timeline is generous, and we have plenty of time to

Detect if there are any legacy service principals used in the environment

WIP…