O365 Get Mail, Odata filter

Thank you for clarifying how to format these odata filter expressions. But I just can’t get this to work and i have a suspicion that the “toRecipients” property is not compatible with filter expressions. While googling I have seen some comments here and there that it can be that way.

I can get other variants of odata filter to function as I want, just not with “toRecipients”.

Best regards
///Jerry