CML Sandbox Failing to launch

[susadmin]

Today I finally managed to get the CML devnet sandbox to launch after a few attempts - great - however I get the following error after about 5 mins of it trying to spin up:

Oops. Launch failed

Sorry, we encountered an issue while launching the environment.

Please contact your admin with the environment link for assistance:

I am not sure who the admin in question is, the feedback link in sandbox brings me to these forums - so here I am. 

Note - this has happened twice in a row in the last hour. 

[susadmin]

Attached is a screenshot of what continues to happen. Using Chrome, launching from the devnet sandbox page. 4 hour reservation selected each time. 

[devnet_geek]

Can you try using other browsers or clear your cache within Chrome. Here's one of my successful launch  

[susadmin]

Thanks for the suggestions. I've just tried it again in an incognito window (no cookies/cache) - exactly the same thing happened. Takes around 6 minutes before it fails. 

[devnet_geek]

If concurrent sessions have reached to max limit, you may not able to reserve and need to check it back again for availability.

[susadmin]

It might be that, however in the past when the system had had no spare sessions the 'Launch' button is simply grayed out - in all these cases where I have made it to the "rocket" screen it looks as though I have a valid session, it just dies during provisioning. If that's the expected behavior and there is no further logging or detail I can get access to, then I suppose I will just accept it.