Solved: About to do a mass license swap and I’m having trouble with the scripting part

🚀 Executive Summary TL;DR: Mass Microsoft 365 license swap scripts often fail silently because M365 API operations are asynchronous, meaning the backend processes requests with a delay, creating race conditions. The solution involves implementing robust verification loops or batching methods to ensure changes are fully applied before proceeding, preventing data inconsistencies. 🎯 Key Takeaways M365 API operations, including license changes, are asynchronous; initial ‘OK’ responses do not guarantee immediate backend processing. Simple PowerShell foreach loops for license swaps can create race conditions, leading to silent failures where only a subset of users receive the intended license. The ‘Trust but Verify’ method is a professional approach that actively checks a user’s license status in a loop, ensuring the new license is applied before removing the old one, providing resilience. For large-scale operations (2000+ users), a ‘Batching & Logging’ method is recommended, decoupling data