If you need this for personalization in the messages, either setDays function or the following snippet can be used  {% let yest = currentTimeInMillis() - 86400000 %}{% let computedDate = toDateTimeOnly(yest) %}{%= formatDate(computedDate, "dd/MM/yyyy") %} Reference - https://experienceleague.adobe.c...

You can take a look at this documentation https://experienceleague.adobe.com/en/docs/journey-optimizer/using/reporting/alerts and validate by keying in the Distribution list (DL) address here. 

You can take a look at the this documentation https://experienceleague.adobe.com/en/docs/journey-optimizer/using/email/configure-email/surface-personalization which details personalizing email email surface configurations.

Unlike in ACC/ACS, we won't be able to hide the mirror page url natively when opened in web view. kindly, log an enhancement with client care team.

person entered the journey and the journey failed for him at some point 

You can try the following{% let newDate = profile._loyaltyone.onboardingJourney.firstOffer.endDate %} {%= formatDate(toDateTimeOnly(newDate), "LLLL dd, YYYY") %}

Currently supported helper functions are documented in this page https://experienceleague.adobe.com/en/docs/journey-optimizer/using/content-management/personalization/functions/functions#helper-helper and switch case isn't in this list

You can use the following snippet {% let d=now %} {%= formatDate(d, "LLLL dd YYYY") %}

https://experienceleague.adobe.com/en/docs/journey-optimizer/using/reporting/global-report/journey-global-reportFailed individual journey is the total number of individual journeys that were not successfully executed. You will find the error reasons in the journey reports too https://experienceleagu...

Can you try it on the following lines {% let a = context.journey.events.`815461771`.commerce.order.cancelDate %}{%= formatDate(toDateTimeOnly(a), "EEEE, LLLL dd, YYYY") %}