To enable concurrent users in Azure Virtual Desktop (AVD) and allow multiple users to connect to the same virtual machine (VM) simultaneously, you need to use a pooled host pool (rather than a personal desktop). In a pooled setup, multiple users share session hosts running Windows 10/11 Enterprise multi-session or Windows Server. Assign users via application groups. Also, use load balancing (e.g., breadth-first or depth-first) to optimize session distribution across hosts.
More at https://learn.microsoft.com/en-us/answers/questions/1160088/azure-virtual-desktop-os
If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.
hth
Marcin