Configuring your Microsoft Partner Access
CloudRadial only has the ability to use one Office 365 tenant per instance and the domain must match with the CloudRadial instance. Prior to configuring your O365 Microsoft Partner access within CloudRadial, both your parent company and the CSP tenant containing your clients must be on one domain.
That domain is the one you initially set up for your CloudRadial instance.
In the case where you have multiple tenants, you will need to migrate your Parent company under your CSP O365 tenant or vice versa.
To migrate your tenant follow this document: https://docs.microsoft.com/en-us/power-platform/admin/move-environment-tenan