During the friending (i.e. linking a CLM project area to the Sodius Adapter) phase, you'll get to a point where you'll have to Authorize Provisional Key. At that point, you'll be required to enter the credentials of the Sodius Adapter administrator, and you may get an error with a red message: An error occured.
When this error happens, you've to authorize the new consumer directly on the Sodius Adapter.
You can then continue the Establishing cross-application Trust procedure.