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Can't remove manager from DL in EMS

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One of our users is manager for many DLs and I need to remove her. I tried to do that with the Subtraction method:

$mydl = Get-DistributionGroup website
$mydl.managedby
eurprd04.prod.outlook.com/Microsoft Exchange Hosted Organizations/tenant.onmicrosoft.com/usera
eurprd04.prod.outlook.com/Microsoft Exchange Hosted Organizations/tenant.onmicrosoft.com/userb
$mydl.managedby -= "eurprd04.prod.outlook.com/Microsoft Exchange Hosted Organizations/tenant.onmicrosoft.com/usera"

Error:
Method invocation failed because [System.Collections.ArrayList] doesn't contain a method named 'op_Subtraction'.
At line:1 char:19
+ $mydl.managedby -= <<<< "eurprd04.prod.outlook.com/Microsoft Exchange Hosted Organizations/tenant.onmicrosoft.com/usera"
+ CategoryInfo : InvalidOperation: (op_Subtraction:String) [], RuntimeException
+ FullyQualifiedErrorId : MethodNotFound

 

This works in on-premises Exchange 2010 SP2 environments but not in Exchange Online. Could this be an RBAC issue maybe? Can someone recommend a workaround maybe?

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