1.) I'm logged in on https://hilfe-uat.o2online.de/ as ad Admin.
2.) I click on "Belohnungskonsole" (Rewards console) (Link-URL: https://telefonica-preview.jiveon.com/oauth2/authorize?client_id=a8o73dv9n8gud90am19rdcq2yyer7y0i.i&response_type=code&s… )
4.) I get the message "Offenbar möchte extension.name auf Ihr Jive-Konto zugreifen." and I click "Erlauben" (Accept)
5.) The URL Manage Rewards opens ("Invalid tenant")
7.) I type "https://telefonica-preview.jiveon.com/ " I am sent back to 3.)
8.) Rinse and repeat
My guess is the SSO or Domain forwarding causes an issue that prevents me from accessing the Rewards console.
FYI: I don't have any issues accessing the Rewards console of our other environment Willkommen | Hilfe
Reviewing through your description, as you mention this is working correctly in one of your Jive cloud instance, but not the other, I would recommend submitting a case in your customer group here in the Jive Community as a next step so that a member of our support team can confirm that the Rewards add-on is correctly configured in the instance where you are seeing this behavior.