Hi @Richard_Sather, the option I shared on the post you linked is available to all customers when updating the people field from the task pane
@Kieran_Price thanks for sharing your feedback with us! The pop-up notifications gives users the choice to add collaborators so it works for different type of workflows. If you are adding users to the people custom field from the task pane and you still don’t receive the prompt to add them as collaborators, please ensure you don’t have browser extensions that may be blocking this. Otherwise, feel free to contact our support team so we can investigate further: How to contact our Support Team ✉
I hope this helps!