Some users get `insufficient privileges to complete the operation.` with GetRoles

**Describe the bug**

Following this tutorial: https://docs.microsoft.com/en-us/azure/static-web-apps/assign-roles-microsoft-graph
Some users get `insufficient privileges to complete the operation.` when calling Microsoft Graph.

**To Reproduce**
Steps to reproduce the behavior:
1. Follow the tutorial
2. Login with several users
3. Some of them will throw `insufficient privileges to complete the operation.` when calling Microsoft Graph.

Code was forked from: https://github.com/staticwebdev/roles-function

**Expected behavior**
It will work for all the users

**Screenshots**

**Device info (if applicable):**
- OS: Windows 11/10, Mac
- Browser Edge
- Version 90

**Additional context**