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I have two lists-

Master and the Child list
I am using the Master List's ID column and I created an integer column in the Child List called "CaseID". CaseID is my Key Column.

Here is the Flow.

For the Icon or button you use for a form submit.  Place formula in the "OnSelect" property.
(Tests for "true", a true result: submit the form, false result: it displays an error message on top of the page.)

Shows error in label

!IsBlank(DataCardValue7_1.Text) And !IsMatch(DataCardValue7_1.Text,Digit & Digit & Digit & Hyphen & Digit & Digit& Digit& Hyphen & Digit & Digit & Digit &Digit)

This Formula can go into the "OnSelect" property of the save or submit button.

If(IsMatch(DATACARDNUMBER.Text, 
           "^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$"
   ),
   SubmitForm(FORMNAME),
   Notify("Email not valid", NotificationType.Error)
)

This formula can go into a label to use on your screen.

This is a very easy solution but finding in on the internet was not. So I am adding it here.

In your powerApp insert label then add the below to it's "Text" Value

The Scenario:
We are using PowerApps as a UI for organization wide users to submit Grant applications. Forms is not an option because users need to come back in and be able to edit. So I created a multi-screen form app that saves the users progress section by section.

So it is way too early in the AM for issues to be coming up.  My brain couldn't comprehend this issue when it came up.

My date format was displaying " lulv" on my app.  A google search brought up some naughty sites and I was like "Whaaaaat?" LOL

The issue.  Using a DISTINCT function in my dropdown brought in the blank value some records had in that column(Field). I didn't need the filter to have the blank value for filtering.

Here's the css code from an unordered list

I believe it is the "SVG"  selector that takes away the blinky thing.

Issue:
How to Hide Power BI iFrame Embedded Report Tabs

Show the navigation tabs:

<iframe width="1140" height="541.25" src="https://app.powerbi.com/reportEmbedYOUR-REPORT_URL" frameborder="0" allowFullScreen="true"></iframe>