Azure devops pipeline improperly formed cron syntax - azure-devops

Question

Trying to set up a cron on azure devops pipeline but I am getting this error message. I looked at the documentation but not sure what is not in line with the doc. Could someone let me know what is wrong with the my cron syntax? Thank you.
Error while validating cron input. Improperly formed cron syntax: '0 21 * * 1-7'.
Here is the entire yml file.
# Starter pipeline
# Start with a minimal pipeline that you can customize to build and deploy your code.
# Add steps that build, run tests, deploy, and more:
# https://aka.ms/yaml
trigger:
- master
schedules:
- cron: "0 21 * * 1-7"
displayName: "pipeline cron test"
branches:
include:
- master
always: true
pool:
vmImage: ubuntu-latest
steps:
- script: echo Hello, world!
displayName: Run a one-line script, changed
- script: |
echo Add other tasks to build, test, and deploy your project.
echo See https://aka.ms/yaml
echo more info
displayName: 'Run a multi-line script'
Here's the relevant part of the doc.
Building Cron Syntax
Each cron syntax consists of 5 values separated by Space character:
1
2
3
4
5
6
mm HH DD MM DW
\ \ \ \ \__ Days of week
\ \ \ \____ Months
\ \ \______ Days
\ \________ Hours
\__________ Minutes
We can use following table to create understand syntax:
Syntax Meaning Accepted Values
mm Minutes 0 to 59
DD Hours 0 to 23
MM Months 1 through 12, full English names, first three letters of English names
DW Days of the Week 0 through 6 (starting with Sunday), full English names, first three letters of English names
Values can be provided in following formats:
Format Example Description
Wildcard * Matches all values for this field
Single value 5 Specifies a single value for this field
Comma delimited 3,5,6 Specifies multiple values for this field. Multiple formats can be combined, like 1,3-6
Ranges 1-3 The inclusive range of values for this field
Intervals */4 or 1-5/2 Intervals to match for this field, such as every 4th value or the range 1-5 with a step interval of 2

Answer 1

You should specify your CRON syntax like the following: "0 21 * * *" or "0 21 * * 0-6", if you want to trigger it for all days of the week.
Days of week: 0 through 6 (starting with Sunday), full English names,
first three letters of English names