3271760 - Error "Service broker identity-broker failed with : Service broker parameters are invalid: To use this service link an identity authentication tenant to the subaccount with the Establish Trust option" setting up the subaccount for IAS

After setting up the subaccount for the user in Identity Authentication Service tenant, when deploying it, the following error shows up:

Service Broker error:  Service broker identity-broker failed with : Service broker parameters are invalid: To use this service link an identity authentication tenant to the subaccount with the Establish Trust option. For more information: https://help.sap.com/viewer/65de2977205c403bbc107264b8eccf4b/Cloud/en-US/161f8f0cfac64c4fa2d973bc5f08a894.html.

Following the instructions in the above link to establish the trust, a blank popup appears:

Identity Authentication

Establish Trust, IAS, Identity Authentication, tenant, create, broker, subaccount, identity-broker , KBA , BC-IAM-IDS , Identity Authentication Service , Problem