This is usually related to GitHub identities in Sentry not being synced up with whoever is making the release. You'll be able to check your identity here.
If you need to add or reconnect your identity, you can do so here
Additionally, if you have already connected your identity and you're seeing this message, you may need to disconnect/reconnect your identity using the links above.
Please note that all members will need to do this if they are creating releases.