502 Server Error - Acmebot not working anymore

[the-project-group]

Describe the bug
Acmbeot was running for years, flawlessly ! Thanks for that!

Today I noticed that some certs expire soon and I was wondering, why they won't get renewed.

To Reproduce
Open the URL of the function app: https://my-function-app.azurewebsites.net/dashboard
It takes a while and then I just get this:

502 - Web server received an invalid response while acting as a gateway or proxy server.
There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.

Stopping / starting the function app doesn't help.

https://shibayan.blob.core.windows.net/azure-keyvault-letsencrypt/v3/latest.zip is throwing a "ResourceNotFound" error.

Any hints what I can check?
Thanks a lot and best regards, Flo.

[shibayan]

Acmebot v3 is no longer supported at the same time as the end of support for Azure Functions v3. To continue using it, you will need to upgrade to v4.

#500