Convert IIF from AAD to FIM

Hi FIM experts,

I'm currently working on the mailbox provisioning from FIM to Exchange Online and i would like to convert the following IIF Azure function to a FIM function. I'll import MSOline Users from FIM and want to trigger the mailbox creation if the result of the function is false (cloudSOAExchMailbox)

CBool(IIF(IsNullOrEmpty([cloudMSExchRecipientDisplayType]),NULL,BitAnd([cloudMSExchRecipientDisplayType],&HFF) = 0))

Thanks,

Yannick