I have a Send Email button in Powerapps when clicked sends out email to list of users. Below is the flow for the same.

Below is the code for Send Email button and display mode. The button doesn't set to disabled even if the flow has run successfully. May i know what is the issue?
Send Email Button OnSelect
ForAll(
Gallery4_2.AllItems,
'SendEmail'.Run(
Label6_82.Text,
Label6_83.Text,
Label6_85.Text,
Label6_81.Text
)
);
Notify(
"Email sent successfully to all users",
NotificationType.Success
);
Set(
FlowResponse,
'SendEmail'.Run(
Label6_82.Text,
Label6_83.Text,
Label6_85.Text,
Label6_81.Text
).success
)
Send Email Button DisplayMode
If(
success,
DisplayMode.Disabled,
DisplayMode.Edit
)