It seems that Microsoft Teams conectors have to be registered/owned by an individual's microsoft account (unless they are published to the app store), whilst the Microsoft Teams app that uses them, can exist independently. Thus, if the individual who developed the connectors leaves the company, and their account is closed, all the company's connectors will stop working. Then new connectors will have to be created and the existing Teams app manifests will have to be modified. This will cause a problem for our clients who rely on them.
Is this correct and is there anything we can do about it?
I understand that the connectors and app could be published to the app store, but it is a private app, intended solely for use by our selves and our clients, so we don't feel it is appropriate to publish it.
The connectors are generated through the Connectors Developer Dashboard, https://outlook.office.com/connectors/publish and are owned/registered to the developer's Microsoft account. We use them to send notifications from our custom web app to our clients' channels in Microsoft Teams.