As per below documentation -
We need to add tenant url in Adobe Marketing cloud config.
What is tenant url here?
And how to get this tenant url?
As mentioned at the document, Tenant url is "https://<tenant_id>.experiencecloud.adobe.com" where tenant id is unique to every customer and provided to you at the time of provisioning.
If you are not aware of this, please reach out to your CSM from Adobe and they should be able to get that information for you.
For example, I used the URL at  as the tenant URL where "mcc089" is the tenant id assigned to my account.