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Correct format for Conditional Expression to avoid error: Expression must contain a 'Boolean value'

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Posted on by CU15021716-0

I'm trying to make a group of actions dependent on the subflow completing successfully, so at the end of my Subflow I have a Set Variable Action that sets a variable named MembershipDataWasExtracted to value 1.

Then I added a IF action, and in the field Conditional Expression, I typed MembershipDataWasExtracted=1, but Power Automate Desktop (v2.53) throws an error: Expression must contain a 'Boolean value'.

The 'help' provided here: https://learn.microsoft.com/en-gb/power-automate/desktop-flows/actions-reference/conditionals#if refers to Input parameters 'Operator', 'First operand', 'Second operand' that I can't see anywhere:

Argument	Optional	Accepts	Default Value	Description
Operator	N/A	Equal to (=), Not equal to (<>), Greater than (>), Greater than or equal to (>=), Less than (<), Less than or equal to (<=), Contains, Does not contain, Is empty, Is not empty, Starts with, Does not start with, Ends with, Does not end with, Is blank, Is not blank	Equal to (=)	Choose the relationship of first operand to the second operand.
First operand	No	*		Enter a value name defined by a previous action, text, number or expression to compare with the second operand.
Second operand	No	*		Enter a value name produced by a previous action, text, number or expression to compare with the first operand.

I see simply one field Conditional Expression:

What am I doing wrong?

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Power Automate Desktop

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eetuRobo 4,204 Super User 2025 Season 2 on at

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The reason you see just one line is because you have chosen Power Fx enabled flow. You might want to create a new flow that is not Power Fx enabled since then it would match that documentation and is bit more simple way to build no code flows.
So have the power fx enabled toggled off

Then the If -action looks like this:

If you want to continue wiht power fx flow then do the following:

add equal sign in the beginning of the Conditional Expression.

If the variable MembershipDataWasExtracted value 1 is text then either convert it to number or in the conditional expression add quotation marks around the 1

Right now you are checking if the text "MembershipDataWasExtracted" is equal to number 1. You need to add equal sign before to tell the Power Fx that its a variable you are referring to and not text. The conditon result needs to be either true or false. So either MembershipDataWasExtracted is 1 or not. But since its comparing different types its not resulting in boolean true or false

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Pstork1 68,717 Most Valuable Professional on at

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When referencing a variable in Power Automate Desktop there should be a % on either side of the name. Your conditional is referencing a static value not a variable. It should look like this.

%MembershipDataWasExtracted%=1

Make sure you use the {x} to insert the variable.

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