Can you confirm if you're a Super Admin, and if you are using this integration, or something else?
Would you mind trying to clear your cache following those steps, as well as trying with another browser and with an incognito window?
If this is still happening, could you clarify what steps exactly you're taking and where exactly you're getting stuck? Could you send us a screenshot of the error message?
The more information, screenshots, and details you can provide the better I can assist!