Trying to do the above trailhead module (https://developer.salesforce.com/en/trailhead/point_click_business_logic/formula_fields#challenge)
I have a formula field returning text with the following formula:
IF( TODAY() > Brandon__SLAExpirationDate__c , 'true', 'false'  )

I have tested it on an account and when the SLA Expiry date  is in the past it shows true and when it is in the future it shows false.

When I check the challenge I get the following error
An account with an SLA date in the past returned an SLA expired of false (it should return true).

I have also tried with returning a checkbox.

Am I misunderstanding the requirements?

Trying to do the above trailhead module (https://developer.salesforce.com/en/trailhead/point_click_business_logic/formula_fields#challenge)
I have a formula field returning text with the following formula:
IF( TODAY() > Brandon__SLAExpirationDate__c , 'true', 'false'  )

I have tested it on an account and when the SLA Expiry date  is in the past it shows true and when it is in the future it shows false.

When I check the challenge I get the following error
An account with an SLA date in the past returned an SLA expired of false (it should return true).

I have also tried with returning a checkbox.

Am I misunderstanding the requirements?