Receiving 500 error on integration

I’m attempting to install the GitLab integration within The integration requires a System OAuth application entry to be created with API access. Upon adding the integration into Sentry we receive a 500 error message. Sentry support assures us this error is on our side of things. We’re running self-hosted Gitlab.

I can confirm from the logs that there is a 500 error message: - - [18/Oct/2019:19:43:01 +0000] “POST /api/v4/projects/124/hooks HTTP/1.1” 500 39 “” “sentry/10.0.0.dev0 (”

Any help on how I can troubleshoot this further would be appreciated.