Webgl cloud build not playing

After cloud building bitbucket Unity project to WebGL and trying to play it directly in build.cloud.unity.com, an error appears.

Is this a known issue?

Error message from browser:

"From “https://build.cloud.unity3d.com”: An error occured running the Unity content on this page. See your browser's JavaScript console for more info. The error was: Script error."

Safari javascript console log:

[Warning] Unexpected CSS token: : (vendor-68be42b355.css, line 5) [Warning] Unexpected CSS token: : (vendor-68be42b355.css, line 5) [Warning] Unexpected CSS token: : (vendor-68be42b355.css, line 5) [Error] Unrecognized Content-Security-Policy directive 'frame-ancestors'. (x4)

[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (jquery.min.map, line 0) [Error] Unrecognized Content-Security-Policy directive 'frame-ancestors'. (x4)

[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (Default WebGL.jsgz, line 0) [Log] Invoking error handler due to (UnityLoader.js, line 1) Script error. [Error] incorrect header check o onload [Error] Failed to load resource: the server responded with a status of 404 (Not Found) (Default WebGL.memgz, line 0) [Log] Invoking error handler due to (UnityLoader.js, line 1) Script error. [Error] incorrect header check o onload [Error] Failed to load resource: the server responded with a status of 404 (Not Found) (Default WebGL.datagz, line 0) [Log] Invoking error handler due to (UnityLoader.js, line 1) Script error. [Error] incorrect header check o onload

-Olli