In one occurrence we wanted to create a VPC peering between the a database hosted on Timescale Cloud and our Kubernetes cluster hosted on Azure. For this you need to put the Azure resource group name in a form on Timescale cloud.
Turns out our resource group name contained an uppercase character and the form on Timescale Cloud has a (broken) validation that required the name to be all lowercase. We couldn't easily change that name since that would have required us to re-create our production AKS/K8S cluster.
After contacting Timescale support (as a paying customer) the answer was basically: "Well, we require the resource group name to be lowercase, we can't change that, sucks to be you, bye"
We can live without that VPC peering, so we didn't push that further, but there are zero technical reasons for that restrictions and I would bet that its just a broken validation regex in their backend that they are unwilling to fix.