Pavlovia usernames should contain letters
Pavlovia uses GitLab to host experiments and users have a single username and password which gives access to both sites.
When creating an account, there may be a temptation for students to use their student number as their username. However, usernames that just contain digits cause problems for any hosted experiments.
Use your institutional email address for your account but ensure that your username contains at least one letter.
If you have already created an account with a numeric username please change it and then wait a few days. Alternatively, you could create a new account and fork projects from your old account.