Error 403 Forbidden while piloting

URL of experiment: Sign in · GitLab

Description of the problem:
I have been trying to pilot an online study on but get stuck on the error 403: Forbidden.
I have tried the troubleshooting of other forum posts on the same error (create a gitlab project ex novo, only using the builder, use only jpeg images etc) but can’t solve the problem. Can someone help? Thank you a lot!

You’re error is probably happening back in Builder. Is an index.html file being created locally? Are there any error messages or confirmations when you sync?

Hello,
No index.html or errors while sync are created. The sync log is normal
"Already up to date.
done
Pushing changes to remote…
done
Successful sync at: 09:28:44, took 1.387s. View synced project here:

"