Automated workflow delivery alert not sending to some individuals??

I have the following workflow automation for an update request

My workflow permissions are set to unrestricted, so I believe this should notify/ send an email with update request to any recipients in the assign to cell even if they are not shared to the sheet...

However I keep getting an email to state that certain people are not been notified recommended to change my automation permission or share them to worksheet... Permission is already unrestricted and some of the data on worksheet they do not need to see.

Any ideas or help to why this is doing this or how to overcome this please??

Much appreciated 😃