invalid request while integrating to salesforce

[oluseyiasol]

When i click on the Get oAuth Token link i get the following error message: 

error=invalid_request&error_description=missing%20required%20code%20challenge

i have attached screenshots on both Salesforce and Servicenow .

Can someone point me to where I should be looking at in terms of troublsshooting?

[Tanushree Maiti]

Hi @oluseyiasol 

Try two options:

1. change Grant_type = Client credential and generate the token 

OR

2. for your error, 

Check "public client" check box in your oauth profile, 

then add value in new field code_challenge_method=S256 

Refer: https://www.servicenow.com/community/hrsd-forum/how-to-use-pkce-in-application-registrie/m-p/2640690...

https://community.powerplatform.com/forums/thread/details/?threadid=5ef8fce8-0613-f011-998a-7c1e5219...