We are trying to understand your situation, but we have not been able to reproduce that Error 500 and "IBM Cloud console is down for maintenance" error you're seeing.
Could you try it again and let us know the datestamp&timezone of when you tried (so we can check our logs)?
Also can you give us the details of your default region, please?, as in if you open
https://cloud.ibm.com/devops/toolchains
does it redirect to:
https://cloud.ibm.com/devops/toolchains?env_id=ibm%3Ayp%3Aeu-de
or to some other non-(eu-de) region?
We did see this entry in the log files:
[2019-07-31T15:06:43.934] [ERROR] template-v2 - Failed to read template from repo https://github.com/open-toolchain/simple-toolchain, branch master, type null: Authorization header contains invalid or expired credentials.
but that occurs when using an invalid Authorization header token, and the response to the browser is not Error 500, but is Error 400 with:
"errorDetails\":\"Property 'access_token' either missing or empty \"
Also, when attempting to create the open-toolchain/simple-toolchain template, it doesn't work; it gives Error 400:
"description":"Failed Schema Validation at prod-region,prod-organization,prod-space,api-key for pipeline"
but creating a toolchain works ok using the repository:
https://github.com/open-toolchain/headless-toolchain