i have a similar problem. From one day to another i get following error, while trying to build and release my app via fastlane:

exportArchive Provisioning profile "<myappbundleid>" doesn't support the External Link Account capability.

Looking in the App developer website, it seems, that the existing and valid profile includes this capability. On the other side, inspecting the profile via xcode profile download, there is no hint that this capability is enabled.

Any suggestions?

Thanks, Robert