We are not able to integrate spectrum into ServiceNow even by using right configuration and credentials.
We have tested the credentials from a browser and we are able to connect without any issues.
Release :21.x
Integration with Service Now
Service Now version was Tokyo and this is not supported until 22.2.4.
Service Now Tokyo is supported only with Spectrum 22.2.4.
In order to integrate with Service Now Tokyo you will need to upgrade to at least Spectrum 22.2.4.
Integration Matrix has now been updated to show this.