‎Teams administrator permission doesn't allow to create/modify resource accounts anymore! - MC780743 (Updated) Changes to Administrator Permissions Required to Create and Manage Teams Resource Accounts

This was started with MC780743 change and following will explain as a summary,

Summary

The message details an update on the rollout timeline for changes to Teams administrator permissions required for creating and managing Teams Phone Resource Accounts. The change, rolling out in December 2024, will require Microsoft 365 Global Admin or User Admin roles for these tasks, affecting Teams Administrator, Teams Communications Administrator, and Teams Telephony Administrator roles. Organizations should prepare by adjusting processes accordingly.

However this was pushed to some of my client tenant recently or many notice recently :). 

Issue

Before change people able to create Resource Accounts without having User Administrator Roles in Tenant and also able to modify those accounts. After MC780743 change, everyone required to have User Administrator Role and i had that attached to my admin account too. However, even after Teams administrator and User administrator both active i couldn't modify the resource accounts and It was giving following error. Basically i created the Resource accounts in bulk and assigned AA or CQ later.

Microsoft article - Manage resource accounts for service numbers - Microsoft Teams | Microsoft Learn

Solution

Surprise :D This was not documented by Microsoft article but randomly found old Skype for business related article during SfB and Teams beginning. Required to add Skype for Business administrator role in addition to "Teams administrator and User administrator"

• Teams administrator
• User administrator
• Skype for Business administrator
  
  

Found in old article Manage resource accounts for service numbers - Microsoft Teams | Microsoft Learn