Hi!
I have been strugling with the same issue for a time now, however in our case instead of an "Integrations" tab we se an "API Credentials" tab:
The user that was provided to me is not a System Administrator user for the https://adminconsole.adobe.com, which is required in order to see either the "Integrations" tab or "API Credentials" tab.
However, I still question if this API Credentials tab is the same as the Integrations tab, as permissions provided in this tab for the Project in use, still gives us Role permissions issue when syncing activities from local AEM to Adobe Target.
Could some one please confirm if this API Credentials tab is now the Integrations tab, or if we SHOULD see the integrations tab anyways?