Issue
When using Office 365 update Item Permission action, it give an output of the List item URL that can not be use afterward. The URL format return by the List item URL as below:
["https://site_url/Lists/list_name/DispForm.aspx?id=2"]
Resolution
Convert the List item URL that has a Collection data type into single text by utilize action "Get Item From Collection".
Additional Information
The details of "Get Item From Collection" can be found here.
Related Links
Help file "Get Item From Collection"