Copy Azure AD Group Security group members to another group

Copy of the object ID of the source group

Get the members of the group using object ID to make sure you are on the right group

Get-AzureADGroupMember -ObjectId a8a3b9f5-3451-4e17-923c-06554e841f55 -All $true

Copy the object ID of the target group

Copy the target group object ID in the second object ID

(Get-AzureADGroupMember -ObjectId a8a3b9f5-3451-4e17-923c-06554e841f55 -All $true) | ForEach-Object {Add-AzureADGroupMember -ObjectId 37cc533e-17ac-4db5-b474-5c5f9a228ed5 -RefObjectId $_.ObjectID}

Now the Members have been copied from source to target Azure AD group

(Get-AzureADGroupMember -ObjectId a8a3b9f5-3451-4e17-923c-06554e841f55 -All $true).count
(Get-AzureADGroupMember -ObjectId 37cc533e-17ac-4db5-b474-5c5f9a228ed5 -All $true).count