So, you have Azure AD connect configured within your active directory environment, you’ve added a new user but you need it to sync to Office 365 right away to assign licenses and get login details to the new user. Follow the below steps to force a sync.

1. Open PowerShell as an administrator on your domain controller where AAD Connect is installed.
2. Copy the following and paste it into your PowerShell window and then hit “Enter”: Start-ADSyncSyncCycle -PolicyType Initial
3. Now for good measure, wait for 2 minutes and then copy and paste the following into the same PowerShell window and hit “Enter”: Start-ADSyncSyncCycle -PolicyType Delta
4. Check in Microsoft 365 to ensure your changes have synced.

Technically it is not necessary to run both commands but I have found that running both works best as it catches all changes and syncs them.

Let me know how you get on or if you run into any snags in the comments.