After the you get a An error occurred: The redirect URI included is not valid when trying to authenticate.
On the URL of the app changed. You have to update the GitLab registration:
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In GitLab, navigate to the registration of the
Include GitLab for Confluence -
Edit the current registration
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Update the Redirect URI to
https://include-gitlab-for-confluence.mibexsoftware.com/oauth-callback
Alternative, you can recreate the registration.