Suzanna Zhuang
A question to a recent information via a M365 message center post (MC224519, this blog post is referenced). In the message center post is mentioned...
Previously, to deploy Office add-ins, Web apps and Teams app would have required you to go to 3 different portals. Now we are removing this fragmentation and allowing you to deploy from one single location. Once available we will start with Azure Active Directory web apps, Office Add-ins, and Teams apps and will be expanding with more workloads gradually.
I have this "Integrated apps" option in my tenant (so it's available) , but I don't understand how this can match with your remark in Integrated apps:
Line-of-business apps developed within your organization are not displayed here. To manage these apps, go to the respective admin center or page...
If I try to add one of the Teams or Azure apps to Integrated apps nothing is there. Please can you add some more details for explanation, or update the message center post with more details.