Follow these steps to connect Salesforce with StackOne Hub successfully.
Sign in to Salesforce
Navigate to App Manager
Enter Application Information
Enable OAuth Settings
https://api.stackone.com/connect/oauth2/salesforce/callback
Select OAuth Scopes
Save the Settings
Create a new Integration
Enter Credentials
https://acme.my.salesforce.com
Connect
error=invalid_client_id&error_description=client%20identifier%20invalid
It can indicate that the Salesforce side still needs to be updated. Although Salesforce quotes up to 10 minutes after generating credentials for this to work, we have observed this taking up to 20 minutes to take effect. Please wait and try again.
error=redirect_uri_mismatch&error_description=redirect_uri%20must%20match%20configuration
This indicates that the redirect URI you have used in the Salesforce Connected App is not correct. This should be set to the StackOne OAuth2 URL https://api.stackone.com/connect/oauth2/salesforce/callback
as described in the section Enable OAuth Settings above.