How do you share a button flow from the mobile app?
From Power automate online, select the flow from your My flows list, and click the share icon to make them an owner so they can modify flow information
On your mobile device, from the button section in Power Automate, tap the small ellipsis to the lower right of the button, then select Share button. When prompted, enter their user information
On your mobile device, from the button section in Power Automate, tap the small ellipsis to the lower right of the button, then select Invite others. When prompted, enter their user information
Button flows need to be created by users individually, not shared - otherwise, notifications sent by them would look as if they were coming from you