License plan disabled options not working in MSOL Powershell

The example you are using will only work when the user laready has the ENTERPRISEPREMIUM SKU assigned, it will not work if you are just assigning a new license. For the latter, you need to also specify the -AddLicense parameter. And if you are using array, you need to add quotes around the service plans to make sure they're recognized as strings.

Lastly, MCOMEETADV can be an actual SKU (license), not a service plan, if purchased outside of the E5. If that's the case, you should not use it with the $disabled_plans variable, but treat it like actual license instead.